Oh my, I can't wait until j.e.f.f.e.r.s descends upon this thread and showers the op with his white, hot rage.
No, PC gaming is holding the industry back. So are the PS4, XBone, PSVita, 3DS, Wii U, EA, Activision, Steam,Ouya and that annoying rash on my arm I had last week. Because claiming that X is holding the industry back is also a trend. One which should stop.
OT: I'd argue that everyone following the same trends would do more to hold the industry back. Homogenization is terrible for innovation. Just because something is popular does not mean it is the only path along which to advance gaming.
I'd say that Nintendo not mindlessly jumping onto the bandwagon is in fact its greatest strength. The industry would be a very different place if not for all the stuff that Nintendo either pioneered or was the first to successfully implement into gaming. Granted, their headstrong ways can also be their weakness. The stuff they try doesn't always work out so well, which has led to some failures in the past and will probably continue to do so in the future.