Capcom is not? Don't you mean they are?
It's definitely a concern of a lot of people. Heck, I'm really looking forward to Third Strike Online and King of Fighters XIII, but all these releases are spreading the players across more games. However, after seeing the number of people who were watching the finals of EVO compared to last year, it might not be as bad because the fanbase is still growing quite a bit.
On the plus side, it looks like the genre will be chilling out a bit when this year is over. No big releases will be on the horizon except for Street Fighter vs Tekken since TTT2 will be arcade only for awhile. It's always possible they'll update something like UMvC3 again, but it damn better well be DLC this time around when they do it lest they piss off people even more so. AND FOR THE LOVE OF GOD, GG ACCENT CORE ONLINE ASW. MAKE IT HAPPEN.