Thanks for your feedback Eric. Since Paul's discourse on this point starts in Romans 9 with an argument that there are two different Israels (9:6), it is no surprise to find him stating the same thing in his conclusion.
There are certainly two Israel’s in scripture, yes, Israel according to the flesh and the true Israel of God, however I believe you have missed my point.
The point I wish to make is not that there aren’t two Israel’s, but that your position makes the “therefore” of V25 and onward rather anticlimactic.
There is a great build up concerning ethnic Israel, how they are blinded and cursed and prideful and cut-off, just to supposedly conclude with “and they will stay this way, no significant change to be expected”.
What grounds would one have to argue that the “they” of V23 “And
they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again” isn’t they same “them/they” as V27-31 “For this is my covenant unto
them, when I shall take away their sins. As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the fathers' sakes. For the gifts and calling of God arewithout repentance. For as ye in times past have not believed God, yet have now obtained mercy through
their unbelief: Even so have these also now not believed, that through your mercy
they also may obtain mercy.”
I trust you see the rather large inconsistency? Not only is this they same “they”, but this “they” must be ethnic Israel as how could I possibly have received any benefit as an elect gentile from the unbelief of my not yet regenerated gentile brethren? (If this is Spiritual Israel is made up of regenerate Jews and Gentiles).
“Yet have now obtained mercy through their unbelief”
The only possible interpretation is that the Jewish people have been cast aside, that you and I might be graft in, thus provoking them (the Jewish people) to jealousy as part of their glorious grafting in again by the Most High’s glorious redemptive plan.
If I may leave you with the eminent Baptist, Mr. Gill:
“Ver. 26. And so all Israel shall be saved,.... Meaning not the mystical spiritual Israel of God, consisting both of Jews and Gentiles, who shall appear to be saved in the Lord with an everlasting salvation, when all God's elect among the latter are gathered in, which is the sense many give into; but the people of the Jews, the generality of them, the body of that nation, called "the fulness" of them, Ro 11:12, and relates to the latter day, when a nation of them shall be born again at once; when, their number being as the sand of the sea, they shall come up out of the lands where they are dispersed, and appoint them one head, Christ, and great shall be the day of Jezreel; when they as a body, even the far greater part of them that shall be in being, shall return and seek the Lord their God, and David their King; shall acknowledge Jesus to be the true Messiah, and shall look to him, believe on him, and be saved by him from wrath to come. … he refers to the last times, and to a very general conversion of them to the Messiah”