Security expert Bruce Schneier nails the core incompetency: “For years I’ve been saying ‘Only two things have made flying safer [since 9/11]: the reinforcement of cockpit doors, and the fact that passengers know now to resist hijackers.'”
So what has the TSA done in response to the attempted attack? They’ve told airlines to make passengers stay in their seats during the last hour of flight. They’ve made it verboten for passengers to hold anything in their laps, again only during the last hour of flight. Perhaps most hilariously telling, they’ve forbidden pilots from announcing when a plane is flying over certain cities and landmarks.
The TSA is essentially security theater, unless citizens get frustrated enough to either stop flying (unfortunately not really a reality for some) or demand policy change.