Has there ever been a fighter with that many characters at once? Fighters with more than 2 are rare enough. 8 would be awesome, though I don't think I'd use it all the time. I think it would be interesting to use as a bonus mode now and then. 3 v 3 and 4 v 4 teams would add new layers of depth to the strategies. It'd be pretty epic. Very unlikely, but epic. Would probably be very laggy though, especially on 3DS.