Egypt needs to stop posting guards -- they are nothing but targets, and that's bad for morale. They need help from an ally with expertise in drones, and go relentlessly on the attack. Setting up ambushes and remotely monitored traps, and monitoring electronic comm in the Sinai (because they're probably riddled with terrorist informants, who can then be identified and killed) is also important. But again, ultimately, the regime can handle the threat, not least because even among the jackass bro'hood supporters, most don't want to see the violent overthrow of the Egyptian gov't, or terrorist acts in the streets of Egyptian cities.
The thing I’m most worried about is if these jackasses decide to follow the Quran’s strictures against representations of the human form and destroy some irreplaceable statue or frieze because they are ‘pagan’ as they and the Taliban have done elsewhere.
Remember the Bhuddas of Bamiyan are now just rubble as is the temple in Ephesus. Damn hooligans!