In all honesty, I don't think Israel has the manpower to completely wipe out Hamas even if they wanted to, unless they kill or expulse all Gazans. Gaza has plenty of places to hide, even moreso nowadays with all the rubble, and they have guaranteed that even the Palestinians who for one reason hated Hamas will now hate the IDF even more.
When Israel declares that they have completely wiped out Hamas in a specific area, then Hamas immediately attacks them back from the zone they had supposedly been wiped out from, it's difficult to explain it with anything other than incapability, because you're setting up a situation where your own population is going to distrust what you tell them.
Netanyahu is incredibly lucky to have the US support him no matter what he does.
There is no "defeating Hamas" at this point. Even if they kill very single current Hamas fighter, the traumatized children whose world they have just destroyed will grow up in squalor and be full of hate . Their choice is to complete the genocide and wipe out Palestinians completely (the only true final solution), or to accept that they'll be fighting the same war in 12-15 years.