Locked bins
Beware quick solutions - central bin locks.
First are bags really a problem; most likely in comparison to the design assumptions - people blocking the isle recovering bags, opposed to exiting with bags in aircraft with modern larger escape exits.
To some passengers locked bins would be seen as a challenge, need lever them open, carry a jemmy! (No, that would be a security issue). But people would still try; a greater isle blocking delay than in retrieving the bags (humans over focus on solving a problem - bins will not open, than changing the course of action - get out of the aircraft)
Other people would place bags under the seat before landing, perhaps a more significant obstacle of unsecured debris and cluttering the isle. More work and responsibility (hassle) for the cabin crew in enforcing ‘bags in bins’.
Every solution is an opportunity for a new problem; beware what we wish for.
Tech failure of bin locks before loading, MEL, …
Ban on-board bags ……… competitive, revenue, money before safety.
Minimise the need to evacuate; modern aircraft are more reliable, stronger structure, better fire containment - more time (but dont depend on it).
An observation; modern ‘plastic’ aircraft appear not to catch fire as easily as older types, but when they do burn, at a later time, the cabin structure seems to be more damaged. Toronto A340, SFO 777, Dubai 777.