The video that is shown of the situation on board after the crash shows the importance of scrapping the large items as carry on luggage. I would encourage the airtravel safety organizations to take drastic actions to re-introduce the free checked baggage allowance and restrict the use of rollaboard suitcases as handluggage. Also to enforce taking only 2 small items as a maximum on board.
This enhances the safety and comfort of all passengers during a normal flight, but especially in case of an emergency.
After all: what is an average of 20 minutes waiting for your suitcase after a flight on the total travel time?
Safety is much more important. In case of an emergency people should be focussing on the evacuation, not on their belongings. After all: their reaction can be the difference between life and death.