Business can't keep up with technology.

Now that people are watching a lot of tv on the net, have you wondered why your tv isn't serving as a big computer monitor? The tech is there already to hook it all up so you have one box serving as your tv and your computer, so why hasn't it happened?

Two answers that are really one answer. Money.
1. Comcast and other cable companies like to charge you for separate broadband and cable services.
2. TV show producers still haven't figured out how to monetize TV over the net. The advertising just doesn't cut it.