I’d say it’s largely because everyone turned their backs on PC gaming to some degree. That there isn’t a financial motivation to push PC gaming as a platform, unlike the licensing money that consoles give their creators.
It’s a decision made purely through account books and has nothing to do with what is better for the consumer. The more in the dark you are about your choices the more willing you’ll be to accept the $60 price tags, DLC, control and gameplay compromises.
I guess I’m most sad about this because the blogs should be the ones to push this point. They should be shouting about poor PC support and ports, shaming these companies in the cold hard light of all their readers. Yet if you scour Joystiq or Kotaku the predominant PC related stories are concerning piracy.
I might invest in a decent gaming machine instead of my non gaming mac (my mac seems to be specifically designed to fail at games).