Anyone who is remotely sentient will listen, consider, and more importantly, plan what to do if things go TU. How many rows forward and aft to an exit? Who or what will be an obstacle to me? What can I wet and put over my face to use as a primitive gas mask?
The bad news is that a considerable proportion of people will not bother, and in the event of an evacuation, clog the aisles by trying to retrieve their luggage and duty-free from the overhead lockers, pierce the slides with stilettos, forget how to undo their belts, inflate their lifejackets prematurely and so on. There is nothing you can do about this if the crew is incapacitated and cannot maintain discipline.
I am sorry to say this, but I think you're tilting at windmills.
BOFH