As an aside, when a passenger leaves the aircraft, voluntarily or involuntarily, I have experienced an 'identify your hand baggage session' with Emirates, where every bag was removed out of the overhead bins and placed in the aisles and people were invited to only put back what was theirs. And this had to be done before the doors were closed.
Putting aside the inherent evacuation issues should something have occurred when all the bags were on the aisle, do the airlines have to ensure that when the person leaves, they don't leave anything behind which could be a problem, and empty the aircraft cabin anyway ?