As they say: A text, without the context, is pretext.
Try reading that entire chapter and I think your question and other's lately about "The Jews" will be answered. Really - the answers to your questions are really in that one chapter alone.
Reading it plainly and literally would also make it clearer.
It's not "God HAD a plan for Israel" ... God has had a plan for Israel from before Creation and HE hasn't changed His mind one iota (Rom 11:32 For God hath concluded them all in unbelief, that he might have mercy upon all.) ... as it says through Romans 11 and so many other books of our Bible. To make of two peoples into one. "To the Jew first and also to the Greek". WE are grafted into 'them', not the other way around.
"the Lamb slain from the foundation of the world"
Rom 11:26,27 And so all Israel shall be saved: as it is written, There shall come out of Zion the Deliverer, and shall turn away ungodliness from Jacob: For this is my covenant unto them, when I shall take away their sins.
"And they shall look upon him whom they have pierced" Zech 12:10 - John 19:37 - Rev. 1:7
Rom 11:2 God hath not cast away his people which he 'foreknew' .... Rom 11:5 Even so then at this present time also there is a 'remnant' according to the election of grace ....
A remnant of Israel that God foreknew were the first to be called "the elect" - now we also, are joined together with them ... that is, the "gentiles" which God through his foreknowledge knew from the foundation, would come and remain in Him by choice are also the same 'elect' - One people.
Zec 13:9 And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.
Amo 9:13 Behold, the days come, saith the LORD, that the plowman shall overtake the reaper, and the treader of grapes him that soweth seed; and the mountains shall drop sweet wine, and all the hills shall melt.
Amo 9:14 And I will bring again the captivity of my people of Israel, and they shall build the waste cities, and inhabit them; and they shall plant vineyards, and drink the wine thereof; they shall also make gardens, and eat the fruit of them.
Amo 9:15 And I will plant them upon their land, and they shall no more be pulled up out of their land which I have given them, saith the LORD thy God.
Isa 45:23 I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
Isa 45:24 Surely, shall one say, in the LORD have I righteousness and strength: even to him shall men come; and all that are incensed against him shall be ashamed.
Isa 45:25 In the LORD shall all the seed of Israel be justified, and shall glory.
Jer 30:17 For I will restore health unto thee, and I will heal thee of thy wounds, saith the LORD; because they called thee an Outcast, saying, This is Zion, whom no man seeketh after.
Jer 30:18 Thus saith the LORD; Behold, I will bring again the captivity of Jacob's tents, and have mercy on his dwelling places; and the city shall be built upon her own heap, and the palace shall remain after the manner thereof.
Jer 30:19 And out of them shall proceed thanksgiving and the voice of them that make merry: and I will multiply them, and they shall not be few; I will also glorify them, and they shall not be small.
Jer 30:20 Their children also shall be as formerly, and their congregation shall be established before me, and I will punish all that oppress them.
Jer 30:21 And their nobles shall be of themselves, and their governor shall proceed from the midst of them; and I will cause him to draw near, and he shall approach unto me: for who is this that engaged his heart to approach unto me? saith the LORD.
Jer 30:22 And ye shall be my people, and I will be your God.
Jer 30:23 Behold, the whirlwind of the LORD goeth forth with fury, a continuing whirlwind: it shall fall with pain upon the head of the wicked.
Jer 30:24 The fierce anger of the LORD shall not return, until he have done it, and until he have performed the intents of his heart: in the latter days ye shall consider it.
Jer 32:37 Behold, I will gather them out of all countries, whither I have driven them in mine anger, and in my fury, and in great wrath; and I will bring them again unto this place, and I will cause them to dwell safely:
Jer 32:38 And they shall be my people, and I will be their God:
Jer 32:39 And I will give them one heart, and one way, that they may fear me forever, for the good of them, and of their children after them:
Jer 32:40 And I will make an everlasting covenant with them, that I will not turn away from them, to do them good; but I will put my fear in their hearts, that they shall not depart from me.
Jer 32:41 Yea, I will rejoice over them to do them good, and I will plant them in this land assuredly with my whole heart and with my whole soul.
Jer 32:42 For thus saith the LORD; Like as I have brought all this great evil upon this people, so will I bring upon them all the good that I have promised them.
Jer 32:43 And fields shall be bought in this land, whereof ye say, It is desolate without man or beast; it is given into the hand of the Chaldeans.
Jer 32:44 Men shall buy fields for money, and subscribe evidences, and seal them, and take witnesses in the land of Benjamin, and in the places about Jerusalem, and in the cities of Judah, and in the cities of the mountains, and in the cities of the valley, and in the cities of the south: for I will cause their captivity to return, saith the LORD.
Jer 33:24 Considerest thou not what this people have spoken, saying, The two families which the LORD hath chosen, he hath even cast them off? thus they have despised my people, that they should be no more a nation before them.
Jer 33:25 Thus saith the LORD; If my covenant be not with day and night, and if I have not appointed the ordinances of heaven and earth;
Jer 33:26 Then will I cast away the seed of Jacob, and David my servant, so that I will not take any of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will cause their captivity to return, and have mercy on them.
Eze 34:22 Therefore will I save my flock, and they shall no more be a prey; and I will judge between cattle and cattle.
Eze 34:23 And I will set up one shepherd over them, and he shall feed them, even my servant David; he shall feed them, and he shall be their shepherd.
Eze 34:24 And I the LORD will be their God, and my servant David a prince among them; I the LORD have spoken it.
Eze 34:25 And I will make with them a covenant of peace, and will cause the evil beasts to cease out of the land: and they shall dwell safely in the wilderness, and sleep in the woods.
Eze 34:26 And I will make them and the places round about my hill a blessing; and I will cause the shower to come down in his season; there shall be showers of blessing.
Eze 34:27 And the tree of the field shall yield her fruit, and the earth shall yield her increase, and they shall be safe in their land, and shall know that I am the LORD, when I have broken the bands of their yoke, and delivered them out of the hand of those that served themselves of them.
Eze 34:28 And they shall no more be a prey to the heathen, neither shall the beast of the land devour them; but they shall dwell safely, and none shall make them afraid.
Eze 34:29 And I will raise up for them a plant of renown, and they shall be no more consumed with hunger in the land, neither bear the shame of the heathen any more.
Eze 34:30 Thus shall they know that I the LORD their God am with them, and that they, even the house of Israel, are my people, saith the Lord GOD.
Eze 34:31 And ye my flock, the flock of my pasture, are men, and I am your God, saith the Lord GOD.
Eze 37:21 And say unto them, Thus saith the Lord GOD; Behold, I will take the children of Israel from among the heathen, whither they be gone, and will gather them on every side, and bring them into their own land:
Eze 37:22 And I will make them one nation in the land upon the mountains of Israel; and one king shall be king to them all: and they shall be no more two nations, neither shall they be divided into two kingdoms any more at all:
Eze 37:23 Neither shall they defile themselves any more with their idols, nor with their detestable things, nor with any of their transgressions: but I will save them out of all their dwelling places, wherein they have sinned, and will cleanse them: so shall they be my people, and I will be their God.
Eze 37:24 And David my servant shall be king over them; and they all shall have one shepherd: they shall also walk in my judgments, and observe my statutes, and do them.
Eze 37:25 And they shall dwell in the land that I have given unto Jacob my servant, wherein your fathers have dwelt; and they shall dwell therein, even they, and their children, and their children's children forever: and my servant David shall be their prince forever.
Eze 37:26 Moreover I will make a covenant of peace with them; it shall be an everlasting covenant with them: and I will place them, and multiply them, and will set my sanctuary in the midst of them forevermore.
Eze 37:27 My tabernacle also shall be with them: yea, I will be their God, and they shall be my people.
Eze 37:28 And the heathen shall know that I the LORD do sanctify Israel, when my sanctuary shall be in the midst of them forevermore.
Eze 39:25 Therefore thus saith the Lord GOD; Now will I bring again the captivity of Jacob, and have mercy upon the whole house of Israel, and will be jealous for my holy name;
Eze 39:26 After that they have borne their shame, and all their trespasses whereby they have trespassed against me, when they dwelt safely in their land, and none made them afraid.
Eze 39:27 When I have brought them again from the people, and gathered them out of their enemies' lands, and am sanctified in them in the sight of many nations;
Eze 39:28 Then shall they know that I am the LORD their God, which caused them to be led into captivity among the heathen: but I have gathered them unto their own land, and have left none of them any more there.
Eze 39:29 Neither will I hide my face any more from them: for I have poured out my spirit upon the house of Israel, saith the Lord GOD.
Hos 3:5 Afterward shall the children of Israel return, and seek the LORD their God, and David their king; and shall fear the LORD and his goodness in the latter days.
All of Zech 14 and Micah 4
Joel 3:16 The LORD also shall roar out of Zion, and utter his voice from Jerusalem; and the heavens and the earth shall shake: but the LORD will be the hope of his people, and the strength of the children of Israel.
Joe 3:17 So shall ye know that I am the LORD your God dwelling in Zion, my holy mountain: then shall Jerusalem be holy, and there shall no strangers pass through her any more.
Joe 3:18 And it shall come to pass in that day, that the mountains shall drop down new wine, and the hills shall flow with milk, and all the rivers of Judah shall flow with waters, and a fountain shall come forth of the house of the LORD, and shall water the valley of Shittim.
Joe 3:19 Egypt shall be a desolation, and Edom shall be a desolate wilderness, for the violence against the children of Judah, because they have shed innocent blood in their land.
Joe 3:20 But Judah shall dwell forever, and Jerusalem from generation to generation.
Joe 3:21 For I will cleanse their blood that I have not cleansed: for the LORD dwelleth in Zion.
I guess we just can't "what if" - if it was God's Plan & Foreknowledge from the Foundation of the World.
Sorry that this may be a lot - but dito on the "thanks for reading."
Annie