It sounds to me like a lot of people are trying to come up with schemes to prevent the taking of luggage; so after-the-fact punishments aren't going to help much.

A little more emphasis during the safety briefing might be about all that can be done.

And let's face it: The odds of you or I ever being in a situation where we have to make a decision about taking personal luggage with us in an evacuation are really, really, really small. @:-)

(I do like the idea of somehow locking all the overhead bins for takeoff and landing - would probably have to be some kind of electronic lock system added; weight would be a factor; but would also prevent the occasional opening and dumping of contents during rough takeoffs and landings.)