cooperplace, you are in a dream-world.
Passengers come from all over the world, including countries where just trying to get people to queue is impossible and seatbelts are unheard of.
If you really think that it is possible to make all these disparate groups of people leave their bags you are delusional.
I have yet to see a single airline that has successfully managed to make all passengers stay sitting down after landing, and that happens every flight.
Pax behaving in accordance with some plan in incredibly rare circumstance like a crash is never going to happen even if there is a world famous disaster where the pax all die because of it. It simply wont reach the consciousness of half the passengers.