It’s time for someone to push an envelope that hasn’t been nudged since Tekken Tag did it over 9 years ago. TvC would have been perfect for this (since it’s 2v2), but for whatever reason, it wasn’t included.
Please work 4-Player support (6-player regarding PS3?), into MvC3. I think the casual and competitive dynamics that are implied by a traditional, tag-team, multiplayer, 2D fighter are hard to deny.
The potential for this has been ignored for too long. Be the first out of the next-gen gate with this feature, and you’ll have a great selling point for MvC3.