There was no reason Street Fighter IV couldn't have come to the Wii. The only thing that had to be cut out was HD, but who needs that? Its a fighting game and a 2D one at that, so there's absolutely nothing that would have taxed the Wii hardware. The only thing is the controls might have sucked, but that's what the Classic Controller is for.
Hell, Capcom could have brought Resident Evil 5 to the Wii if they wanted to. Activision was able to bring COD Black Ops to the Wii, so there's really no excuse.