Eventually (I hope never) some event, say a heavy landing, RTO or worse, will cause a locker to open (I've actually lost count of the times that I've seen one pop open whilst taxying) and some "trolly bag" is going to cause someone some serious injury. The CAA will act retrospectively (as usual) and all baggage above a certain weight or the size of a brief case, will go where it belongs....in the HOLD.
Happy New Year
Silvertop