The other day I saw a group of teenagers playing 3ds Smash Bros against each other. They said they never, ever use the 3d and just leave it off. (Actually a bunch of them just bought the bigger screen ds with no 3d at all.)
Just a reminder that technical advances in the presentation of entertainment are not necessarily a big part of its appeal, compared to UX design, networking, the social layer, simplicity, and cuteness.
Cf. Minecraft, Scratch, SMS, Candy Crush, Angry Birds.
My daughters LOVE playing Super Mario Bros. on an old NES--a game more than 30 years old.