They will point to other Islamic groups. It is not just Hamas right? Islamic Jihad etc? They would also say that this is now a new security situation and that they would like to occupy to bring stability. So they will occupy Northern Gaza, bring the PA in and say that they will be responsible for administration while Israel will take care of security. They will slowly move settlers in, create walls, checkpoints, and constantly point to the October 7 attack as justification, effectively pressuring the Palestinians even further. This will lead to more terrorism, more reprisals, and more bombings south of Gaza. And they will rinse repeat this until they take all of those lands creating refugees, and reduce the Palestinians to a few densely populated enclaves, entirely dependent on Israel, surrounded and separated by Israeli settlements and heavy militarization. In essence ethnic cleansing, apartheid and land theft.
This is a tried and tested Israeli tactic that they pursued in the West Bank. It is what will happen.
And can anyone trust Bibi and his ultra-right wing government that runs on a "No Palestinian Statehood" platform? The US will have no real say in this, because the Israelis will spin it and lie to the US that they are not occupying at all - just ensuring security and the US will let it happen. How do I know this? Because it has happened before and the US let it happen.