I think who is going to put their hands in their pockets to rebuild Gaza? The displacement of Palestinians may become a forced reality simply because families will be unwilling to wait for reconstruction of residential buildings and associated infrastructure so there may be a relatively covert exodus of Palesitinians to other countries anyway.
The Palestinians staying maybe the most hard headed about ensuring misery for the sake of their land and probably encompass a lot of the populace that support Hamas and want to continue their perceived existential conflict with Israel. If we have a new generation of Palestinians whose raison detre is to exact revenge on Israel we have a real problem. stored up for the future. If having Gaza as it currently stands is just a precursor to some sort of second war in 10 years time then we are in a room cycle really.
In terms of basic humanity and hope for the future a dispersal of Palestinians may actually offer hope as they will not be locked in to a terrorist organisation whose sole function seems to have been to launch a heinous suicidal attack on it's neighbours.
There may be hope for Gaza under new leadership and a commitment to leave but if Hamas continue to be viewed as viable leaders Gaza is doomed to be frank. The Palestinians to some degree forfeits d choice of leadership by supporting Hamas governance and a continued support of the ideology of this group will make other powers in the world think that migration is the only answer to a lasting peace.