It might be beneficial for some subs. A lot of subs would suffer though. Foremost Iama I guess because with nobody organising amas from people that are not redditors it's going to be pretty hard. That will make a dent as amas are one if not the biggest magnet for new users. Other subs would have problems too, mainly those that are heavily moderated such as /r/science or /r/askhistorians (although I doubt they will leave).