It is hard to imagine a Pal leader agreeing to any reasonable peace plan. The Pal leaders know that, should one agree to a reasonable agreement, he would be assassinated forthwith.
I think they are taking steps to prevent that. I'm not sure what all those steps are, but I suspect the steps include having all the Arab states publicly and enthusiastically endorse the agreement (should agreement be reached). That will undercut any arguments that the Palestinians got some sort of "bad deal".
One choice that will impact whether these negotiations succeed or not is: what everyone does about Hamas. They can either try to marginalize them or bring them into the process.
I hope they try to bring them into the process if at all possible. That will lead to Hamas becoming more moderate in their viewpoints.
If they marginalize Hamas, it will almost certainly make them resort to great violence.