The matter is settled in
Romans 11:23,
Quote:
23. 23 And they also, if they abide not still in unbelief, shall be grafted in: for God is able to graft them in again.
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The moment "they", meaning Jews, no longer abide in unbelief, God will immediately graft them back into the vine. Jews from all time periods since the first century until now, on an individual level, have chosen to no longer abide in unbelief and committed their faith to the Son of God, Jesus of Nazareth (and not "another Jesus").
Going further into the chapter, in verse 32, the reason the blindness happened and why God gave them all up to unbelief is so He could have mercy upon all (i.e. not just some). And we know that it's according to His mercy He saves us.
And by the way, in order for "all Israel to be saved", as verse 26 reads, there has to be a true group of descended from Jacob in order to be Jews group of people who can and will be saved.
And as a matter of fact, I've met some of them.