It is all simple really.
Ban all carry ons. For starters, that means each 747 loads 40 minutes faster as the usual idiots trying to move house and stuff it all into the already packed overheads for 40 minutes are dispensed with, so 85% of flights will now leave AHEAD of time.
So nothing in the overhead bins. Then at least 40 coach pax CAN have a lay down seat without airlines spending one extra cent. (Well they need to bash out the divider panels, big deal.) Pax just lay down in the overhead bins. If the lights from down below are too bright, you just pull the overhead door shut. To get out, you just thump loudly, and hope someone hears. Or put little FA call buzzers up there.
A few little ladders and they are in business. Darn good idea really. They could sell advertising space on the ladders. Going to the restroom down the ladder in turbulence is going to be a hassle, but hey, you fly coach and there are certain downsides come with the territory.
------------------
~
Glen ~