In the end the leaders can't accomplish anything no matter how long they negotiate because Palestinians reject a Jewish majority Israel to begin with. So, encouraging or demanding negotiations is really pointless until Palestinians change their mindset. The only thing that alarms them is continued building in Jerusalem and the West Bank. Those who encourage a freeze do a positive negotiations outcome no favours.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)
from the article: Palestinian Authority officially changes name to 'State of Palestine'