The underpinning has already changed. Television is nothing more than viewable files nowadays. They can be easily sent along the same pathway as email and web pages. Of course there's a lot more data in video. There's even a higher amount in high-definition video. That's why I'm more likely to watch ten minute segments of specialized programming than normal fare. The satellite is going to have to remain an expense for a lot longer, I fear.
I do get some some chunks of programming via the Internet. Most of the video is subscribed and automatically downloaded via tversity media server software. I play mostly HD files from my hard drive and through my PlayStation 3.
For example, I can keep up on computer happenings via CNET's Buzz Out Loud. I can watch lions and all sorts of creatures via Earth-Touch. NASA's Jet Propulsion Labs send out periodic space news. At the moment, I am about to view some HD news via the Washington Post.
Eventually, there will be unimaginably-wide access to global, on-demand programming on any subject one desires. You will be what you watch. There will be no excuse for simply viewing 'what's on'.