We're watching the death of traditional "TV" and traditional "radio" in slow motion. The networks are going to be the big losers. At one time, they provided a useful service as an intermediary between content producers and watchers/listeners, but today, the content owners can cut out the middleman completely. I just heard an ad from a radio commentator who was promoting her iPhone app. It is free, and allows you to listen to her radio show live from your iPhone, but also automatically downloads the podcast version so you can listen to it later....no radio "channel" required.
The idea that network owners like Comcast can somehow force their customer base to use their network by buying and owning content like NBC is really mis-guided, as there are so many other content options out there.
Once again, the old adage is true: "The Internet regards censorship (or control) as damage and routes around it." Comcast's control of NBC looks like damage to Internet users, and alternates routes to content will and are forming.