also, do not forget one main aspect:
prerendered sprites take a lot of space. hundreds of pictures of animation, different models, different robes, different weapons, you name it. for every character in the game.
enters 3d model. add models of weapons and some skins and let the engine take care of everything else.
and that's why <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" /> won't ship on 3 CDs <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />