Israel would object to aid and weapons flows into Gaza. It would be fine with Gazans leaving the Strip. The problem is there are currently zero takers globally for a significant Palestinian refugee population, in part, as other comments have mentioned, due to the history of Palestinian refugee populations in the Middle East. (To my knowledge, Palestinian Americans have been fine and productive members of society.)

> To my knowledge, Palestinian Americans have been fine and productive members of society

With a few notable exceptions... A Palestinian-American murdered Bobby Kennedy for being too supportive of Israel.

https://en.wikipedia.org/wiki/Sirhan_Sirhan