1) Israel has put itself in the position of being perceived as an unpopular bully (i.e., by people outside the region). That means that when "September" comes there will be a lot of piling on, people not before involved will take a moral stance against Israel. This effect will be huge and Israel will wonder where all its new enemies came from. 2) Fayyad has been in the middle of a tug of war between the west and Muslims. The west has played stupid, the Muslims smart. He will probably be gone quickly. 3) The single most relevant factor is the psychology of the Arab resident of Israel and Gaza and the WB. The population will almost certainly become completely unmanageable overnight. Israel has been using livestock management techniques and soon will realize their livestock have human brains. 4) Because the "transition" has been so downplayed, most of the excitement will come from individuals, not groups. In place of Hamas and a few other groups, Israel will be dealing with tens of thousands of groups, each consisting of one or a few people.
Police arrest 18-year-old Palestinian suspected in Old City stabbing (Haaretz)
from the article: Palestinians are preparing for September, but is Israel?