That way users only have to pay one streaming service, the content is available in every country, the rightsholders are paid fairly by the content consumed instead of these never-ending monthly fees for one show and ignoring the rest of the library.
If they don't do this, piracy again becomes the best option and media companies will only ever get stupid disengaged customers and that's a bad business model because those people eventually leave.
The time of predatory streaming service bullshit is over. Provide a service which puts customers first or they'll all go back to piracy. They already are.
[0] Notably, radio has a compulsory licensing scheme, but the government turned up the license cost on Internet radio so high that nobody can make a profit unless they sell their soul to the RIAA ala Spotify.
The reason I put "nationalise" in quotes is because any such partnership needs to be a global commercial partnership between companies. It can't be actually nationalised by any country because then it would focus only on that country and that place's copyright laws (and potentially censorship or content laws).
This garbage of the same streaming service in different countries having different content also needs to stop.
People can torrent any show anywhere and they'll do that if it's not available on a reasonable streaming service. If which there are few or none anymore.
There will definitely be some difficulties (Netflix estimated 4M views but you are expected to bring in 6M views so clearly you need to pay $$$$$, or you are only going to bring in 2M views but you still need to pay $$$) but I think they can be overcome.