A reconcillation with Fatah would un-do this, but Hamas seems reluctant to engage on that point since reconcillation REQUIRES recognition of Israel and an absence of violence. Hamas must realize that with UN recognition, further violence only plays to the strong suit of Israels defense capability. What Israel cannot fight is an absence of violence.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Hamas to Abbas: Transfer the Palestinian Authority to us, not Netanyahu