I still think this is a quite an unrealistically pessimistic outlook, so long as there are a decent handful of privacy-interested technerds, it'll be effectively impossible. The DVD encryption code was initially hailed as the end of piracy, but it was broken about 7 days into being released.

• TPMs are already very easy to crack.
• DRM protection today can be overcome simply with OBS, and all the protection in the world won't work against a DisplayPort cable and a recording card.
• Identifying every stream to a physical person is not reliable, watermarks get reverse-engineered, accounts use fake details, shows get sold, video databases get hacked, pirates use hacked accounts etc.
• Most ISPs haven't used IPv6 because it's impractical, not because they love cgNAT, plus having your own public address is still very common. Even if you couldn't get your own public address, port tunnelling is easy and would immediately become the norm. Plus if anything, only having a public IPv6 address would make your server even less accessible than cgNAT.

The adage remains true, to keep a thing secret and secure, you have to be perfect at security 100% of the time. To hack a thing, copy it a million times, and make it effectively public, it takes one lucky break. Perfect security is logically impossible, people will find a way.