If the Jews left Israel what would happen in the middle east?

I’m sure we have asked and discussed similar questions, but it has been a while and it is on my mind, because a friend on Facebook has raised the topic of the Palestinians and Israelis.

Let’s say the Jews leave and get open entry to the US. They destroy, or at least damage, most of the Israeli infrastructure. Now the Palestinians can come in and have the land, or any other group in the area. Do the other Arab countries allow the Palestinains to just take over the land? What if Israel left most of the infrastructure intact? Would that make a difference to what group would try to lay claim? Would they destroy holy Jewish and Christian sights, or protect them? Would the Middle East have peace? Would the Middle East let go of their hate towards the west. I realize not the whole Middle East hates the west, I only mean would the terrorists and governments who do finally let go of their hate? Would Arabs and Persians live peacefully again and prosper?