[AppyPappy]

When the MB takes over, the first thing they will do is purge the military which will effectively neuter it. If they are truly aligned with Iran, some hardware will transfer to Iran who needs it to defend against us.
The Egyptians can’t even defend Egypt from Egypt. They can’t do much against Israel. They need Jordan and Syria.

[Netz]

Never underestimate 80 million “stoned Muslims”. The Egyptians are smart enough to let the military do it's “thing”, get organized and primed to invade the Sinai and the Israeli Negev desert. True, that there is chaos there right now but there are many elements within the military that have been itching to fight Israel with the M1A Abrams tanks since the 1980’s. One cannot underestimate the stupidity of desperate Islamicists. It would be enough to have Iran/Syria and Gaza attack Israel while the Egyptians joining in at some point and then, the Aswan dam will be obliterated...

[Leaning Right]

When the MB takes over, the first thing they will do is purge the military

You're probably right. If they do, they'll ruin the Egyptian army, much like Stalin did to the Soviet army during the purges of the 1930's.