George Friedman argues that Israel's main issue isn't its borders "but its dependence on outside powers for its national security":

Any country that creates a national security policy based on the willingness of another country to come to its assistance has a fundamental flaw that will, at some point, be mortal. The precise borders should be those that a) can be defended and b) do not create barriers to aid when that aid is most needed. In 1973, U.S. President Richard Nixon withheld resupply for some days, pressing Israel to the edge. U.S. interests were not those of Israel. This is the mortal danger to Israel — a national security requirement that outstrips its ability to underwrite it.

Hence, of course, the necessity for a super-powerful lobby in the outside power to act as a guarantor. But what if the guarantor has to pick between a democratic Egypt and an Israel careening toward apartheid? That was once a fantasy. It may not be for much longer. Hence the increasing hope/prediction among some on the far right that Egypt will become an Islamist state. That would keep things simpler, wouldn't it?