Who do you think will replace Abbas once he croaks? I suspect that it won't be Marwan Barghouti since he's still stuck in prison.
Not familiar enough with Palestinian politics to make a plausible guess. The real danger is Hamas taking over, like they did in Gaza. They are more popular than Fatah (as they usually are).
Also, what about having Israel do a unilateral withdrawal from most of the West Bank similar to what Ehud Olmert suggested back in 2006? I mean if Israel's parliament will ever become more left-wing.
Never going to happen, I'd say. The last unilateral withdrawal turned out to be a disastrous decision. The West Bank is much more strategic and sensitive than Gaza, and has some major Jewish religious sites to boot. Can't see any scenario of an unilateral withdrawal under any plausible government.