I disagree that Firefly is useless, you can do some really amazing stuff with it, if you know how. That said, I really like Superfly, but since I don't have a cuda GPU and my aging CPU is rather slow, Superfly takes forever. So unless they implement support for AMD cards, Superfly will remain something I will only use sparingly.

Also keep in mind that not everyone are after the 'photoreal' look, but prefer the more stylized look Firefly can give you. People have different styles and goals, and it would be foolish to get rid of Firefly IMO

As for Superfly textures for V4, just run the old ones through EZskin3, and you're good to go. There are some vendors that provide Superfly mats also, Seven being one of them.