I'll tell you what would happen. Israel would be attacked immediately by the Arab world, just as they attacked the moment Israel was established as a state, and again on Yom Kippur in 1967. God defended them then and might now as well. But all the negotiations for peace have been nothing but a sham, ALL our Presidents who push for peace are delusional on the subject because the fact of the matter is that the Palestinians (meaning the terrorist leaders, not the people though the people are mostly in favor of the leaders anyway) sabotage every peace effort. They do not want peace, they want Israel dead, pushed into the sea. They say as much and everybody ignores it. Their maps are drawn with no Israel on them. They don't want a state alongside Israel; they could have had that time and time again and with much help from Israel in accomplishing it too, but they refused every offer, sabotaged every deal. Anything the Palestinians get is turned into a launching place for weapons against Israel. Israel gave up Gaza and the Palestinians let it fall into ruin and built tunnels for weapons and their daily pastime is to lob rockets at Israel. Still people think Oh why can't there be peace. What's that line about the evidence of insanity. That you keep doing something over and over that never works?
Well, you may get your wish anyway. Obama seems inclined to abandon Israel. Followers of Bible prophecy are gritting our teeth and wondering what is going to happen... The War of Armageddon perhaps?