"Some of those who were not trained (ie the pax) acted irrationally because of selfishness or lack of awareness. My conclusion - the bags issue is an industry problem and training/education is the only answer."
I would think that given the difficulty inherent in trying to educate those either potentially, or actually, in an emergency situation to act responsibly and according to regulation, the only answer to this dilemma is to seriously restrict the amount of baggage that can be taken into the cabin to begin with.
This would be enforceable on the ground prior to departure; it may cause some issues and arguments but they will be contained away from the A/C.
It would be reasonable to allow folks access to their medication, and devices en route - phones, laptops and so on - and indeed pragmatic in terms of items with batteries which are liable to catch fire from time to time, and better in the cabin than in the hold - but the size of bags could be limited to a laptop carrier or small backpack, which could be stored under the seat and carried easily on ones person.
Overhead lockers would be slightly defunct if no one was allowed to use them for baggage, but in a situation like this, it would cut out one of the potential threats to fast evacuation.
Simply put: if the baggage isn't there, people won't be trying to access it, or indeed have to waste time trying to prevent others from accessing theirs.