I think ultimately you have to consider whether Hamas can agree to making term ceasefire as their reason for existence is to strike Israel. It maybe the on going talks are aimed at PR rather than concrete goals as both sides have very much ingrained determination to continue conflict. Israel want Hamas quite rightly destroyed and Hamas aren't a party of peace indeed the opposite.
I think from Hamas perspective they can't look to their people as surrendering i.e. Agreeing to peace as they have lost so much. Without funding for regeneration how popular will Hamas be if they release all remaining hostages even if Israel does withdraw across the border?.Hamas can't exactly claim a victory for its people especially if it is neutered by preventions of rearming. If Hamas agree to peace I think internally it would split as there would be literally no where to go. There may be an element of the suicide fighter set into Hamas psychology where they are willing to go down in a blaze of glory taking everyone with them; we have to realise most Hamas fighters are designed to death when engaging with a much superior army.
From Israel's perspective without a change in government Benjamin Netanyahu will wish to complete what he vowed to i.e. destroy Hamas in Rafah but he must be seen to engage in talks to see if a peace can be gained prior to this.
Ironically I think the destruction of Hamas may the only way in reality for a sustainable peace to occur no matter our strength of feeling. If Hamas eventually can't sustain power then new representatives from the Palestinian people may make headway with Israel.