I'd like to think Capcom isn't going to Street Fighter IV this thing.
It already has, pretty much. Both MvC3 and SFIV have received one huge, retail-only expansion. SSFIV Arcade Edition was available for download for SSFIV owners for $15, so it's not nearly as bad as plunking down another $40 at the store.
The one thing I found interesting, though, is how much more positive (or less negative) the reaction was to SSFIV's announcement relative to Ultimate. I think it largely had to do with the unexpected stigma of releasing it in the same year as the original game. Ultimate was released exactly nine months after the original MvC3, but both hit in 2011. SSFIV was released 14 months after its original game, obviously in the next year. I guess that made a difference.
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Yoblazer: http://s15.postimage.org/tvuz2cgo9/857441231223333_1.gif
Watch and you'll see... someday I'll be... part of your world!