So? if you search a little, you will also find out why the repercussions of a framebuffer bandwidth limitation can be limited; pixel-doubling would be required to beat ~20 fps (because of pixel transfer costs), but all 3d-intensive software-rendered games need pixel-doubling to beat ~5 fps now (because of pixel computation costs), so it would still be a dramatic improvement for gaming. It could also enable some cool desktop/window manager related stuff, where low FPS won't be a killer.