Hamas knows that Israel will always be able to wreak havoc on Gaza should it not fully adhere to the terms of the ceasefire. A long-term ceasefire in conjunction with confidence-building measures will certainly change the nature of the bilateral relations between Israel and Hamas, which could gradually lead to lifting the blockade altogether. Furthermore, a resolution to the conflict between Hamas and the PA can and should take place, provided that it will not in any way undermine Israel's national security, after Israel resolves its separate conflict with the PA.
There are many cynics who believe that peace between Israel and Hamas is nothing but an illusion. On the contrary, anyone who maintains that the current situation is sustainable is misguided, as they ignore both the turmoil and the bloodshed over the past 12 years, and the reality on the ground that cannot be changed.