I cut the cable 5 years ago and I have never looked back. I can utilize many sources and avenues for what I want to watch, but I am technically inclined. The advent of Popcorn for the general masses is going to push the cable cutter approach even further.
Really, if someone would just find an easy, reasonably priced way to give sports and local news to everyone on a Roku/ATV/FireTV/etc. I think it would push the demise of cable tv into hyperdrive.