I think the best way to bring the Smash community together would be for Smash 4 to exceed all our expectations and be the new ideal for smash!
I'm a melee player myself, so naturally I am hoping Smash 4 will be closer to melee. But honestly even if the gameplay isn't as fast or technical as melee, if we have a good competitive online mode, maybe an ELO system with skill-based matchmaking....... I would be so happy. I feel that a strong online mode would do a lot to mitigate any anger from the melee camp that the game isn't Melee 2.0.