When the United Nations General Assembly passes a motion, with funding, for Egypt to again administer Gaza. The negotiating partners must change, as there is not enough 'Goodwill'.
It is not possible at present or in the near future. As long as Hamas and Islamic Jihad keep firing rockets and sending fighters into Israel, the situation will not change. Israel will carry out retaliatory attacks and will not stop the radical settlers. The new state of Palestine and Israel could separate United Nations peacekeeping forces in the future.