Here’s a short essay that treats the plight of television and its eventual collapse given the popularity of the Internet. Many reasons are cited for Internet having won the broadcast war, but the essay is short and accessible:

See http://www.paulgraham.com/convergence.html.

See also this chart (http://www.itfacts.biz/how-people-are-watching-tv-in-q4-2008/12762) describing medium used to watch TV versus viewer age.