What is it you think they should do?
Well ... first I think they need to talk.
Then I'd propose moving Egypt's border to include the Gaza Strip. Kick out Hamas. An international peacekeeping presence may be required during the transition.
Make the Gazans Egyptians under law and control. Give them the full rights and privileges of any Egyptian citizen.
This will mean Egypt will want lots of money to rebuild that area, so I'd expect Uncle Sam to write a check, along with other human rights organizations. If I were al-Sisi I'd also want a check from Israel.
Israel relinquishes all control over the area, including that nice little registry they keep. Israel keeps its fence as protection and demarcation of an actual border between two sovereign nation states.
And we see how it goes.
@Sanguine