You will find no such proof. However, one thing is certain and is amply documented in scripture is that regardless of what may occur, God will preserve a remnant of Israel for Himself. (See the book of Obadiah as an example of this, or the book of Ruth.)
Just to clarify: I wasn't referring to eradicating every Jew, this will not happen; but to the State of Israel. There were 2 exiles, and the third return is to be the last. But does the State of Israel count as the 3rd return, or just some fluke of a few decades before the Jews resume their constant wandering, only to await the final redemption.
There is a source though (I've forgotten) that claims that there was never a time that there were no Jews in Israel. Some always remained.