On a somewhat related front, I don't think that TV as we now know it is going away anytime soon, but I think that its days of being the exclusive distribution mechanism for program-length episodic shows are numbered. Actually, it could be argued that they're already over, thanks to season box sets on DVD and episodes available on the iTunes Music Store. As this article points out, this can potentially have wonderful and unexpected ramifications for "cult hit" shows that find themselves cancelled prematurely by brain-dead network executives (like, oh, a certain series named after bioluminescent insects).
TV could get interesting again, and you wouldn't even need a TV. Shiny.