So we have Marvel vs. Capcom, and the recent Tatsunoko vs. Capcom, the real question is what group do you want to see Capcom characters fight next? I'm sort of stealing mine from someone, but all the did was throw it out there without really elaborating on it. Hanna Barbera vs. Capcom.
I know what you're thinking, "How could the likes of Scooby and the gang make a good fighting game cast?" Well first of all, Tron Bon and Servbot were in MVC2. Second, there are other Hanna Barbera characters, like Space Ghost, Birdman (who Capcom made a game about by the way, so obviously they have the license), Hong Kong Phooey, Race Bannon, Zandor, heck, SWAT Kats is owned by Hanna Barbera, so throw T-Bone and Razor in there too. Tell me that wouldn't make an awesome fighting game!