That, of course, is not the metric. Again the analogy to HBO/Showtime of the past is apt. When HBO came out, or any channel beyond the "big three" did the older channels viewing go down? Yes. More choice = less people watching any one thing. But the big three remained.
The only difference is that Big Media (in a move that future generations will understand to be idiotic) allowed people to bypass first paying for the basic package, unlike HBO et al, of the past. So we see the cord switchers, paying (a lot, and more to come) for streaming and not linear. And telling us, over and over, how much money they supposedly saved by getting some, but not all, hockey games and how Indiana-Minnesota is really good enough and they don't need Ohio State-Penn State, and so on.
The main question is, if you don't really care about TV, why are you on a TV enthusiasts website?