If Israel decides to disengage from Gaza and close the border crossings. There is little anyone can do about it. The main burden will not be on Israel's Egyptian neighbors but on the UN and EU, Rafah will only be an access point for the EU and UN. Responsibility for Gaza Strip will be handed over to the EU and what they organize with the UN and Egypt. Because this has been put on the table, there will added importance for reconciliation between the PA and Hamas, so that Gaza Strip is not excluded from the two state solution. And they can negotiate united with Israel. However and the US must understand that there will be no talks with the PA if Hamas are reconciled and Gilad Shalit is not returned. It is the policy of many nations, US, UK to mention a few not to negotiate with hostage takers. No direct talks with a PA that actively holds a Israel hostage, I think any reasonable person would understand this.
U.S., allies conduct 1 air strike in Syria and 11 in Iraq against ISIS militants (Reuters)
from the article: Egypt: Israel wants to 'dump' Gaza on us