After canceling my cable subscription, I consulted with my three grown children, none of whom has cable, to see how they watched TV. They were pretty aligned: They used Netflix, HBO, Amazon and Hulu. My daughter Kate and her husband also subscribed to Showtime. When I asked them how they watched TV, they said Netflix was their default channel — not only the first channel they went to but also the channel they were most likely to browse when they weren't sure what they were looking for.