The terrorists could cause problems in the Suez, but it would be a difficult place for them to operate from as there is nothing but sand along the canal. There is hardly a rock to hide behind.
I’m not saying that we do not have a problem, but simply saying that it is not an international disaster.
Furthermore, in 1979 the protesters in Teheran were calling for a theocracy, while the protesters in Cairo and Alex are calling for democracy.
Yes, that's true for about half of the canal. But, on the half that's closest to the Med, there are all kinds of places to hide while launching guerrilla attacks. There are several cities, and grassy farmlands, right along the banks.
Going back to what you said earlier, you also have to entertain the possibility that a future government - one less friendly to both the US and Israel, could close down the Suez to some, or much traffic as a leverage tool. Then what? Do we invade? I'm not sure there's an appetite for that. Whatever would happen, it would give upward pressure to the oil markets. Oil has spiked almost $20 bucks just in these two days
And yes, it doesn't appear these populist protest are calling for theocratic rule, as perhaps was the case in the Iranian Revolution, but as the "free elections" in Gaza three years ago proved, the Theocrats could come to power in a (fairly) free election.