I hear they are bringing in the designers of homeless-proof benches to create a new class of “seating” called Rail. It will be a 36” tall rail with seat belts to allow safe leaning. This will fit 9 in the same space that 6 would sit.
These same airlines that created carry-on fees are now considering Coat fees if you don’t carry-on or check a bag. Too often people were found with a pair of socks and underwear in a coat pocket to avoid a bag fee.