I'm generally not a fan of broad nerfs. It would probably serve better if they figured a way of making 1 hand, and 1 hand + shield more attractive with a specialty or mechanic unique to them that dual wield and 2 hand lacks so that it can serve a niche or other desirable function outside just dealing damage.
Right now, they are all essentially competing for the same job at the moment, with nothing to differentiate besides damage output and ap cost.
Personally, I hope that if they do a nerf to dual wield/two hand it is not too severe. I have played way too many games where those two styles are incredibly lackluster or not worth using over sword and board.
