Remember who can crush Fatah in just one day as was previously seen in Gaza and what was done there can also be done to Abbas & Co. in the West Bank if Israel retreats from these areas too. And your endeared Abu Mazen, your trusted "partner" for peace, is a dyed-in-the-wool Islamic militant that's now humbled only due to the brow beating he has taken from Israel over the years of confrontation with the IDF. Abbas has already publicly warned that he would take the side of his "brothers" within Hamas if push came to shove with Israel and if given the opportunity he would jump at the chance to do so against a weakened and compromised Israel.
Five people killed in car crash near Hebron (Haaretz)
from the article: Peres to Haaretz: Israel could reach a peace deal with Abbas