Wow, I just had a discussion with my wife about giving up cable TV but keeping cable Internet for this reason. My argument was during the 1/2 hour of a silly sitcom, I can become knowledgeable with just about any subject of my choosing. And even if I want to veg out, I can still find most shows on the web.
Her counter argument was the cable box + remote are easier to use than hooking up a computer to the TV, which is what we currently do.