It would be interesting to see where the ‘luggers’ were sat. Whether passengers who sit in premium classes believe they have a right to lug cases out in the event of an emergency or whether it is passengers in economy. Either way, the airlines need to do something about it and the idea of the overheads automatically locking would be a simple and effective solution.
I recently bought a small Tumi clutch bag, which is always by my side and contains, passport, mobile, wallet, credit cards, computer back up disc, 1 of my trakdot units (and one religious good luck item). It is small enough to quickly push up my short/jacket. This means that there is NOTHING in my bags that is not replaceable.