Posters are confused. There are two different configurations being discussed in the linked article.
The 10 extra rows has been going on for years. Airline like Delta and Southwest have already reconfigured many of their planes. You remove a couple of inches from each seat and you get a few extra rows. They remove things like seat pockets and seat padding. and switch to smaller frames. Seats are very uncomfortable, for many of us. I've read "experts" say give away free IFE and snacks and passengers won't realize how uncomfortable they are.
The second thing being discussed is the equivalent of standing room. You'll lean against some kind of "padded board" and then fasten a belt. Adding a bicycle type seat is one option being "discussed". The potential market is for very short flights. Intra-island flights in Hawaii is one example. Flights between islands in the Caribbean. How long do we stand on buses in Disney? I guess it might work if the flight was 20 minutes, driving isn't an option and there was no delay on the ground. That configuration won't work for longer flights. An airline will lose the ability to quickly reposition the plane for a different route, irregular ops.
