Israeli Politics

I don't get involved with Israeli politics too much, but this is something that I have been thinking about recently.
When it comes to a peace agreement between the Israelis and the Palestinians there is one major issue which is usually not mentioned which I think is very important from an Israeli point of view. That is who is their partner? He is a leader of an entity which hasn't held elections since 2005. Now, Israel does have deals with dictators but they in general have control over their territory which is not the case with the PA. So where does Abbas's support come from? It mainly comes from being propped up by western governments through their financial support and their training of police and security personnel. And here is where the lesson of Egypt and Hosni Mubarak enters. Should Israel rely on the assurance of the west for the continued support of the current PA government? What happens if there is a political or popular uprising, similar to what happened in Egypt? Will America drop Abbas like a hot potato? What is the argument for why Israel should risk that?