Rosters have nothing to do with the lack of fans in NCAA. BB is a football game too you know, they are rendering the same 22 guys out there, along with some crazy lighting effects and graphics. They are able to get 3D fans for 190,000 fan stadiums (no joke) because they are using some form of tech that EA obviously isn't willing to go out of their way to get. EA has been and probalby always will be focused on doing it themselves, which unfortunately is usually lackluster.
Anything 3D would be a lot better than the 2D mosh pit crowds we have now, even if its 4 models doing the same thing.