Actually, I think it is much more dire than just a two-front war with Egypt. Israel is more than capable of fighting Egypt conventionallly, BTW. When you throw in Iranian-backed missiles, war-headed with any manner of nasty stuff, that’s when the equation changes.
The only firm and subtantive way to stop that sh!t outright are nukes of various flavors. If you google what and how many nukes Israel has, estimates are around at least 200.
Obama isn’t really going to play into the solution; he may play into the onset by being an ass and hanging Israel out on the clothesline unattended, but whatever happens after that when Israel feels threatened enough, Obama will be about as useful as tits on a castrated bull.