The ideal solution is not a Netflix monopoly, it’s one where content providers must pick a single price, and any streaming service can pay that price and provide access to the content. That way you can pay for only Netflix, but get access to everything. Netflix wouldn’t end up with a monopoly though, because anybody else could offer a better service and people could switch to it and not lose access to anything.

This is unlikely to happen anytime soon due to the intentional clusterfuck of laws like copyright, but it would solve the problem neatly.