If the Quartet wants a realistic proposal, they should take into account that Israel is dominated by the right-wing, people who don't want to give up the West Bank. They should therefore issue a type of "threat", such as: If negotiations have not been concluded by October of next year, the Quartet will recommend to the Security Council a unilateral decision on all the issues still outstanding, including Jerusalem, borders, refugees, etc., and this final plan will also depend on their view on who was responsible for the delay in decision making. This will get even Israel moving, since it will allow Obama to act after the US elections in early November. Even if he is not reelected, he still remains President until Jan 20th. Without such a threat, Israel under Netanyahu will spend the time talking, and next year Abbas will be in worse shape than now. My suggestion to Abbas: Just decline the present proposal and explain your reasons.
About 2,000 demonstrators protest 'occupation policy and fascist settlers' in Nazareth (Haaretz)
from the article: Quartet to meet in Brussels in bid to restart Israeli-Palestinian talks