No. But it's their most recent one, which they were hesitant to make until Sony got involved and helped pay for it, and it severely underperformed. The higher-ups at Capcom are probably wondering whether it's worth it to keep trying with 2D fighters, and they're frankly probably leaning towards no.
The only thing MvC would have over Street Fighter is the popularity of Marvel characters, which I admit, is a big thing. But the chaotic clusterfuck that is MvC gameplay appeals pretty much exclusively to people who have been playing fighting games for years, so I don't know if attracting the kind of person who doesn't really play fighting games but just wants to check out MvC4 because it has Marvel characters that they've enjoyed in the MCU movies would be a good thing. You think casuals get turned off of Street Fighter by going online and getting their asses kicked? Imagine how they'd feel going online in MvC4 and getting stuck in a 500 hit combo with absolutely nothing they can do about it.
Or maybe I'm just hoping really hard that this is all the case because I like fighting games, love Marvel characters, and hate MvC gameplay. I'd kill for a far less chaotic fighter with Marvel characters.