i dont think a true, good 3d fighter will emerge from a fighter. it will emerge from an action game. think of dmc3 but multiplayer and a lot of adjustments:
http://youtube.com/watch?v=3T_RdUPNg6k
its like a fighting game, but in 3d and no player to beat on. trust me, dmc3 has so many quirks in the engine its ridiculous.