it's about the two sides each overcoming their main obstacles - their main reservations. bibi to be willing to make a real territorial compromise, which would include evacuating settlements (not just freezing construction in them for a while), & abbas to make a real. lasting peace w/his jewish neighbour - no more claims & no ROR. unless they cross those rubicons there's no sense to anything else they do. at the time being bibi is the one most clearly exposed as the one not willing. his construction freeze problem is just a symptom of that.
from the article: 'Obama told Netanyahu, Abbas: We all must take risks for peace'