It looks simple after someone has started doing it. Apple already has by offering on iTunes content that is also offered on cable; what they haven't done (yet) is making it available concurrently with cable. That's coming once companies decide they can make more money by doing that than by giving cable exclusives - money will be the key driver of this change and it simply hasn't been lucrative enough (yet).
If you look at the evolution of television and movies; content delievry has shifted from one method to another as choice (in the form of delivery capacity), and therefore revenue, has increased. Broadly viewed, it moved from 3 or 4 OTA broadcast channels to cable with HBO to cable / satellite with hundreds of choices. Internet content delivery offers a quantum leap in choices and will move content from a cable based model to a new one. ISPs owned by cable companies realize that and is one of the things driving bandwidth caps.
Right, but the key thing that you focus on is that "money will be the key driver" and that "therefor revenue, has increased". Everyone talks about this stuff as, "I want to pay less to the cable companies and just buy the shows or channels that I want!" The content providers and the cable companies do not want to offer a solution that results in less dollars being paid monthly to them. So when you start think about individual pricing, think about the iTunes model where it would cost thousands of dollars a month to buy all the shows that a typical family consumes on television each month. Or the product will come with ads that can't be skipped. But there is no, "everything gets cheap but I get all my shows and channels" solution. At least not a legal solution.
I for one am ready to pay for streaming always available shows and sports programs. I paid for NBA TV last year and while there were some technological hurdles and the blackout issues were terribly annoying. Basically, I liked being able to watch NBA games on TVs, computers and my iPad. The service could be made better and the NBA could still make a good profit on this, which they could share with the cable company.