Whilst I think this is great for disabled gamers, I really don't think there are enough disabled gamers to come to the conclusion this is designed specifically for their needs. Lot's of people, including me, hate some of the button layouts in games. This is for those people who have been complaining about silly layouts for years. I hate using L2 or R2 for triggers for instance and (as others have mentioned) L3 for running.
This is absolutely for the disabled gamer.
Every single piece of tech that runs an OS these days has always had extensive diability options, Android, iOS, Windows, OSX, Windows phone,
So while non-disabled gamers can reap the benefits in some ways and perhaps Sony thought they could hit two birds with one stone here, it was always intended for people with functional disabilities. I'd even posit that there's a way bigger need for these features coming from the disabled gamers than the occassional weirdo who wants to swap X and O just because it's like that in his japanese animes.
This is about Sony being inclusive to everyone, disabilities or not.
Edit: Oh, you now actually believe they aim this at the disabled merely for sly PR business reasons? Come the fuck on.