I don't know, but shelling x or y region won't necessarily lead to the definitive defeat of Hamas. I understand the desire to root them out, and the Palestinian people would be better off if they were, but rooting them out probably isn't as simple as rolling in however many thousand troops and military assets. As you said, they're not all likely just going to hang out waiting to be blown up.
I'm skeptical as to whether Israel will withdraw from Gaza, seems like the perfect opportunity to seize it given they've already informed Palestinians that they should flee for their lives. Maybe they do, maybe they don't, what happens next is honestly anyone's guess.
My assumption is things won't just go back to how they were before, it'll probably be different but I'm just not sure how. It's going to be really interesting to see how things play out for Hamas, the Palestinian people, and Israel going forward. Even if active combat subsides there's still probably a fallout of some sort. How couldn't there be? If only on a legal, military, or policy level. It's not like any side is going to move on as if nothing has happened.
I don't know what Israel wants to do with Gaza going forward, hence my concern. How they behaved before the most recent Hamas attack doesn't necessarily dictate how they'll proceed going forward, I think this could probably said of political moves as well. This was the largest Hamas assault ever was it not? Or at least in recent memory?
I'd imagine there's a lot of fear, shock, trauma, anger, and so on within Israel now that can be directly tied to the Hamas attack, I wouldn't be surprised to see politicians try to capitalize on that to push political agendas through or to try and win political points. I don't need to know the ins and outs of Israeli politics to understand that politicians will be politicians, or that a notable tragedy can fuel unexpected or previously unthinkable decisions.
I don't have a crystal ball telling me what the Israeli government will do, and I mention them specifically because while they aren't representative of every Israeli, Israel isn't a monolith, they are calling the shots.
It's worth asking because any faction that doesn't want to fight openly will likely insert itself into the general Palestinian populace, they provide cover and somewhere to hide. Ideologies are a tough thing to kill, and the lives lost on each side will likely spur on countless ideologies.