Now the Israeli response is coming. Lots of Gazans are going to die. It's not going to be very nice.
Muslim sentiment is going to change from "Great, a bunch of Jews have been killed" to "the Jews are massacring our people".
One thing about sentiments in these situations - losers are abandoned. Sadam, Bin Laden, and ISIS are now mostly forgotten by the masses, not because their ideology has been rejected, but because they lost. If Hamas is perceived as losing this confrontation, then they may join the list of irrelevant losers. That might pave the way for someone else to represent the Gazans.
But, before that happens, there will come death and destruction.