It's because this would happen without the consent of Israel. Which will lead to Israel not recognizing the Palestinian state. Why would Israel not consent? I think it's because they're still undecided about borders (should they be based on 1967 borders, the fate of Jewish settlements in the West Bank, and the fate of Jerusalem). Really, it's Netanyahu's fault, for not trying to come to any agreement on the settlements, and then humiliating our President and setting back the peace process when he said the 1967 borders (along with mutually-agreed-upon land swaps) was an "indefensible" position. The loss of Weiner's seat in liberal New York City is said to be backlash against Obama's more balanced approach to Israel/Palestine among the most conservative Orthodox Jews. And we know how the majority of Americans feels about Israel and Palestine. It's a mess. And I hope I'm wrong, but I don't see how peace can be reached until Netanyahu is replaced by a more liberal and level-headed Prime Minister. Meanwhile, the U.S. will veto full UN membership for Palestine (but they'll still proabbly achieve observer status, like the Vatican), and that will harm our relations with the Muslim world.