Quote from ThrikDepends on whether you mean moving on in the context of graphics or gameplay. 2D means the gameplay is going to be like a lot of other games.
Has a really good full 3D fighting game actually been made yet? I'm not really a follower of the genre. By full 3D I mean an entirely 3D fighting arena with a full range of movement, not just the use of polygons.
The soul calibur series made use of the third dimension pretty well. Nothing revolutionary, but I don't think those games would be quite the same in 2D.