That assumption requires you to believe that on Day 91 that Obama will transform himself into Mamma Legga and cry "Build, baby, build!". You are kidding yourself. The USA will not ask for another freeze after 90 days because if the borders aren't agreed to then the USA will declare the "US mediated peace process" to be dead and buried. That will be a disaster for Israel, because once the USA withdraws from the field then the "incentive package" will lapse and the UNSC will be free to take the USA's place.
U.S., allies conduct 22 strikes against ISIS targets in Iraq, Syria (Reuters)
from the article: Netanyahu poised to win razor-thin support for West Bank freeze