Admittedly, I could have worded my question differently. I see that scripture in Rev 21 states that New Jerusalem comes down to new earth. I have not seen scriptural evidence that New Jerusalem comes down at any point prior to that.
If I am recalling correctly, you proposed that New Jerusalem came down to earth. Is there a scriptural source for the concept that New Jerusalem descends prior to Rev 21? Or were you speaking speculatively?
For example, we are given that we are called "Abraham's seed" which includes Jacob
Which includes only the Jacob that is in Christ, because flesh is not counted for the children of God.
we are given that not all Israel is Israel, but can we then assume that Israel is not all Israel?
Not all
of Israel are Israel. I believe there is no objection to rephrase this as "Not all flesh descendants of Israel are Spiritual Israel".
I believe it would be fair to rephrase your question as "Is there justification to assume that non-flesh Israel exists in Spiritual Israel?"
It's a good question. Consider these points:
1) Do two become one in marriage? Scripture says yes. A marriage between the Church and Christ the bridegroom would mean that the Church becomes a part of Israel by that union. And that can especially be the case if we are talking about a spiritual flesh of "the new creature". There are timing considerations with the marriage that gets into a whole amil/premil/postmil conversation.
2) If a rock can be raised up as a descendant of Abraham, this clearly highlights the fact that anything is possible with God. If God wanted to "poof" new physical descendants of Judah out of thin air, it is in His ability to do so. If God wanted to make someone in the womb suddenly be a descendant of Judah, it is in His ability to do so. E.g. the school of thought that Jesus wasn't adopted by Joseph, that He was literally made into a descendant of Joseph to fulfil the patrilineal requirement.
3) Many modern Christians are of Israel by flesh despite not being recognized as part of Israel by the modern Rabbinic orders. Who has the authority to decide whom will count as Israel or not? Does a descendant of Jacob-Israel in Christianity count as Israel or as the Church? Someone that is initially not esteemed to be of flesh may be determined to be flesh at a later time. Are they not both Israel and Church?
4) Israel is the firstborn of God (cf. Exo 4:22), Christ is the firstborn of God (cf. Psalm 89:27). Is Christ Israel? Or are there multiple firstborns of God?
And we are given that Israel is blinded for a time for our sake, but can we then assume that Israel's sight will never be restored?
True Spiritual Israel is blinded
in part. There are still parts of true Israel that became incorporated into the Church such as Paul and were given sight. The entirety of true Israel will be saved (salvation promise) but this does not negate the fact that not all flesh of Israel are true Spiritual Israel, and not all of flesh Israel will be saved.
The Dispensationalist argument is that all of flesh Israel by Judah would be saved (including every unrepentant murderer, "child of hell" Pharisee, rich man in Hades, and even Judas Iscariot). The Christian perspective is "maybe they find redemption" because God works in mysterious ways therefore maybe there is some posthumous purgatory-like redemption arc in store for people like Judas. But the Christian perspective is certainly not "yes, that is necessarily the case". We would be speculating completely as to whether all physical descendants of Judah would be saved. I believe that the parable of the wedding banquet points to the idea that full inclusion is not the case, but as a parable, there is room for discussion and interpretation.
We also have to remember that not all that call themselves Jews are Jews. There are antichrist decievers that scripture warns about. Therefore even if we somehow decided that there was hypergrace for all physical descendants of Judah, not all that call themselves that are necessarily going to be as advertised. And we also have to address the passage that explains that a Jew is not one outwardly but only through circumcision of the heart.
Especially considering that Satan will be bound a thousand years so that he can no longer deceive the nations (and is this equivalent to blinding?).
I agree that we can explore the possibility of hypergrace salvation for all descendants of Judah. God shews mercy on those He shews mercy. I still don't find the salvation for Judas Iscariot pitch to be compelling, but the possibility for coversation is there.
That's a salvation question.
The big ticket item in Dispensationalism is the geopolitics: the interpretation of land promises. Not only will Dispensationalists purport that the land needs to be claimed right now, but also that only descendants of Judah that reject Christ are allowed to inherit it. If you are a 2% Ashkenazi by genetics, but a practising Christian, Talmudic Jews will give you no place in the land and Dispensationalists will support their decision for denial. Hateful antisemitic Dispensationalists will even take it a step further to rub salt in the wound by claiming that you aren't really a descendant of Judah anyway because you don't reject Christ and don't practice Talmudic Judaism. Somehow a Christian is considered an apostate in the Dispensationalist playbook instead of properly recognizing that they didn't leave their faith, they fulfilled it in Christ by becoming Christian. They didn't replace their faith, they fulfilled it. It's that "Israel is blind
in part" bit that hateful antisemitic Dispensationalists have a hard time trying to explain. Many Dispensationalists hate Christians with Jewish ancestry for the same reason many Talmudic Jews hate Christians. Their scriptures are different, therefore the conclusions that they draw from are going to be different. It's part of the reason Dispensationalist exegetics doesn't work in Christian scripture. The clash can lead to frustration.
Is it possible by Christian scripture that everyone currently in the middle east belongs exactly where they are? Absolutely. I'm not proposing border changes or anything for the sake of politics. But there is a gross incompatibility between Dispensationalism and the Christian Bible in terms of how promises and terms are considered. There is also a strange antisemitic hatred for Christians with Jewish ancestry that needs to be addressed like an elephant in a room. There is a strange hatred for what Christian scripture actually states compared to what Talmudic Judaism and Dispensationalism claim. Christian scripture does not expressly support the modern Talmudic Judaic land-claim by means of the promises to Abraham and seed.
Is that possession of land ensured by right of the promises to Abraham and Seed? No. Not unless those individuals are Christ's per Gal 3.
Will each dead descendant of Judah resurrect in order to possess that land? No. We know this because Heb 11 tells us that some of those dead Hebrews missed the opportunity.
All of this falls on deaf ears to Dispensationalists because cognitive dissonance is painful to deal with. Christians are destined to suffer under hateful people.