LOL@ thinking UMVC3 will kill the community. Fuck no. MVC3 by all means was a very broken piece of shit, and by all means, most people thought some changes needed to be made. Also, A very famous leaker had already leaked that a "Updated MVC3" was in the works like months ago. To most members of the fighting game community, this is hardly new news: The leaked characters are. Some people actually typed in random people, fishing for images, and that's how all of the people were found. Lawlz.
As far as "how many different versions of street fighter are there?" There's 3 versions of Street Fighter 4 (Vanilla, Super, AE), 2 versions of 3rd strike (Original and Online Edition), Millions of versions of street fighter 2.
While I believe UMVC3 is coming way earlier than need be, this isn't gonna do shit to the fighting game community.