I wouldn't dismiss their competition either. I specifically paid for Hulu solely for "The Handmaids Tail", an incredibly well done drama. ( https://m.imdb.com/title/tt5834204/ ) Still dwarfed by Netflix with a ~$10B market cap, this battle isn't over. Amazon has a decent shot as well.
It’s also not zero sum though. There doesn’t have to be just one successful company standing.
There are only 8 billion people in the world, and each can spend at most X hours per day watching streaming video. It seems to be clearly in the interest of each provider to try to obtain all X of those hours.