There is talk by people outside the industry that having overhead lockers that automatically locked in the case of a fire would be a good idea, or lockers that could be locked by flight crew as part of their evacuation drill. There are lots of reasons why these ideas are not the best ones.
Firstly, we have several cases each year of items in lockers actually being the cause of the fire. With the rise in the number of devices with lithium batteries in them (ie virtually all laptops, tablets and phones these days) there is a rise in the risk of fire. If the fire was actually locked inside an overhead locker it would cause delays in firefighting. Whilst in the case of a huge fire such as the Aeroflot situation the only fire fighting should be done by the fire brigade, cabin crew and flight crew are trained in basic fire fighting so that if a fire is discovered on board during flight they can carry out initial fire prevention actions. It would be foolish to assume they can wait till they are on the ground for the fire brigade to turn up 9they might be mid atlantic) and it would be foolish also to have an auto-locking system that locks a fire in. Any delay could be disastrous.
Secondly, adding another item to the flight crew evacuation check list - this checklist is already pared down to the minimum number of actions to make the aircraft safe to evacuate and then get the hell out of there. We are trained to switch off running engines (don't want passengers jumping into live engines!) make sure the emergency exit lights are on, tell ATC, then get out ourselves. Adding superfluous items to the list because the airline doesn't limit hand baggage and passengers can't be trusted to leave their bags behind again adds potential for delay and error. This checklist must be left with the absolute bare minimum on it. The other issue is it wouldn't matter if it was part of the pilot checks if passengers are standing up before the aircraft has stopped to retrieve bags. They would still be getting their bags.
Thirdly, if lockers auto locked, you would still get passengers trying to get their bags out and holding up evacuation. If the default reactions are to behave irrationally and try and get bags, they will still try to do this and fail. Passengers would still be able to get the bags out from under the chair in front and drop those down the slides, so the potential for injury to passengers below would still be there too.
The thing is that if it's an acknowledge fact that passengers will try to retrieve their bags even in a burning plane, all chance for that to happen needs to be removed. And the only way I can see for that to happen is to limit carry on baggage.
Most crew btw have a 'grab bag' that they keep beside them during take off and landing which has car keys, passport, phone, medication (and licence for pilots.) Nothing else. EVERYTHING else can be replaced. Even the things in a grab bag can be replaced if it comes down to your stuff or your life.