The month that Israel withdrew from Gaza it sequestered more land in the West Bank than it gave up in Gaza. There is no good faith on either side, but one side is armed to the teeth and unafraid to demonstrate its eliminationist intent and one side has firecrackers to announce its dismay.
Why should Hamas give up its only bargaining position to achieve nothing except yet one more promise from Israel that they won't be nasty for a couple of days ? I have no idea how this works, any more than you do, but I'd imagine that when Israel seriously considers dismantling the occupation of the West Bank, maybe Hamas may seriously consider accepting Israel. But till then, fuggedabout it. keep to the Fen Causeway