The future restoration of the nation of Israel will involve their re-grafting into the olive tree, the one people of God. The restoration of Israel will mean their becoming part of the “true Israel” by faith in Jesus Christ the Messiah.
I believe this is seen prophetically in the sealing ("sealing" =salvation, sealed by the Holy Spirit) of the twelve tribes of Israel in Revelation Chapt 7, during the sixth of the seven seals at the "beginning of sorrows" of the tribulation. Israel will finally fulfill the destiny long given to them by God to evangelize the world. This leads to a great harvest of souls and also to "Jacob's trouble" (Jer 30:7) (much worse than the holocaust) from which a remnant will be saved and physically hidden and protected by God from the "beast" during the last 3 1/2 years of the Great Tribulation.
>>>Israel will finally fulfill the destiny long given to them by God to evangelize the world.<<<
I believe that has already occurred. That is, Israel has already evangelized the world, beginning about 2000 years ago, with names like Peter, James, Paul, John, and others called from Israel to be the elect (Ephesians 1:4-12.) They are still doing so today through their words.
Philip