Remember there have been very successful migrations of people throughout history. The US is literally a migrant nation to an extent. I don't think migraton should be viewed as a doomsday scenario.
The interest in a migration from Gaza as given the foreseeable political climate I can't see peace working. Yes politicians talk of the two state solution but this mantra is looking increasingly hollow given the failure to Ihace peace for decades and I am afraid October 7th has driven peace to quite a remote place.
The idea of leaving Hamas to groom thousands of impoverished embittered young men to form the next wave of attack on Israel is absolutely real. Hamas have not changed; their reason for existence is still the destruction of Israel. After the recent holocaust memorial events we have to member if Hamas were given the equivalent military strength of Naxi Germany we simply would have another holocaust. The terrorists on October 7th were only stopped in their rampage if terror because they had vastly inferior arms to the IDF.
Set against this background to our can see Israel's case yo destroy Hamas and if that can't be done militarily maybe you look to political means. You could weaken Hamas politically by allowing migration of Palestinian civilians from whom they draw support.
The alternative is to have a very poor territory that will continue to be a breeding ground for terrorism exacerbated by what will be a poorly performing economy. Gazan civilians will blame the poverty on Israel and will continue to support those that promise vengeance i.e. Hamas. The only long term outcome seems to be another terrorist outburst at some point and we are back to square one