My dude, there are still bad decisions being made over Street Fighter even now and some of the easiest is the fact that M.Bison is still alive, the story refuses to truly move forward to any real degree and alot of SF5's plotpoints(and thus SF3's) just vanished into the ether for a potentially stupid as hell "plotpoint" in SF4 to be an "eventuality"(Akuma becoming Oni) rather than actually going into anything truly meaningful.
And they want to add Darkstalkers to that? No thanks.
I'm not sure why you antagonizing DD somehow makes your point any better...
Because I don't believe they can do it and there's nothing at all showing Capcom CAN do it. Like I'm not even getting the hell is even happening here, I didn't come in here to shit on your idea, I came in here to agree with
@OtherGalaxy that officially molding Darkstalkers into Street Fighter's world is a terrible idea for many, many reasons and even brought up series and franchises which did it well or did the slow building blocks no problem.
It's no different than Soul Calibur having a few bits of Tekken within it which "apparently" has them in the same universe but it would be dumb as shit if they was actually the same universe due to so many questions.