In all fairness why does the Palestinian position have to be a zero sum game, they should be allowed to both go to the UN and have negotiations if they choose. Barak is looking at a tilt for PM so if he leaves it will for that reason. You have on the left you have Livni, Mofaz and Barak that all what Netanuyahu's job on the right you have Lieberman. Israel government are always changing before a full term so under this current pressure in September it will be a statistical irregularity for this government to run the full course and a election not to be called.
Ofir Akunis officially replaces Danny Danon as minister of science, technology, and space (Haaretz)
from the article: Netanyahu's peace stance is running Israel into a wall