The situation is certainly worthy of the most serious attention of any traveler to the region, and I wouldn't minimize it. But note that in the second attack, police were ready enough to kill/wound the attackers, rather than arrive after they'd melted away. (And skilled and equipped well enough to succeed.) That suggests that Egypt remains quite serious about protecting tourism.

As I probably mentioned before we last spent time in Egypt a few days after the African embassy bombings and American retaliation. We avoided tourist gaggles (slipping into the Egyption Museum area from the back, not necessarily as clever as I then thought) but were seriously impressed by a strong and professional police presence. Shooters were positioned high and well separated, and equipment like walkie talkies seemed to be clear and top quality. That's all I could notice, having no military bg.

So if I were booked today, I'd do the same as before. Avoid American properties and tourist crowds, and keep my head down.