The rise of the forces of jihadist Islam in Egypt places the US and other Western powers in an uncomfortable position. The US is the guarantor of Egypt's peace treaty with Israel. That treaty is based on the proposition of land for peace. Israel gave Egypt the Sinai in 1982 and in exchange it received a peace treaty with Egypt. Now that the Islamists are poised to take power, the treaty is effectively null and void.
The question naturally arises: Will the US act in accordance with its role as guarantor of the peace and demand that the new Egyptian government give Sinai back to Israel? Because if the Obama administration or whatever administration is in power when Egypt abrogates the treaty does not issue such a demand, and stand behind it, and if the EU does not support the demand, the entire concept of land-for-peace will be exposed as a hoax.
Indeed the land-for-peace formula will be exposed as a twofold fiction. First, it is based on the false proposition that the peace process is a two-way street. Israel gives land, the Arabs give peace. But the inevitable death of the Egyptian-Israeli peace accord under an Egyptian jihadist regime makes clear that the land-for-peace formula is a one-way street. Israeli land giveaways are permanent. Arab commitments to peace can be revoked at any time...Temporary "Arab commitments to peace": in other words, a hudna. (That said, Arabs do remain committed to peace, but only the sort that will be in place once Muslims have Islamized Dar al Harb, i.e. us.)