A cessation of rocket fire is Israeli govt's only hope of "defeating" hamas. Only by humiliating them as "weak" in the eyes of the gazan arabs will Israel have hope of transferring power from hamas to fatah like they want to do. Despite the fact that Hamas failed in every possible way since becoming a "legitimite" (in the eyes of gazans and vis a vis their election to actual political power) governing entity, the lives of Gazans are completely miserable and probably worse than ever before, nonetheless, Hamas has not ceased its attacks on Israel, nor has it stopped the other Fatah-associated militias (Aqsa brigades, etc) from firing rockets into Israel. This perceived militancy and stubbornness against Israel is why Gazans prefer Hamas. Hamas shows it is willing to make war on Israel, even against insurmountable odds and with quite a bit of chutzpah. That legitimizes them to the gazan arab muslim nazis.
And I don't think for a second that they will submit and 'stop' rocket attacks at the demand of israel because they know this would deligitimize them to the gazan muslims. As long as Hamas has the public support, they will wield the power there, short of a fullscale IDF invasion, and even if that did happen, when the IDF gives over to Fatah, Hamas will lead another coup against them, as Fatah is powerless to stop Hamas, and without public support as well.