I suppose you mean that content creators can't decide which platform can or cannot distribute their content, right? Because obviously, if they can, then they can sell exclusive rights and that's the system we have today.
I suppose you need to enforce that all the distributors pay the same price for the content (otherwise again, we end up with the system we have today, where some distributors can pay more and get some kind of exclusivity through that).
Then how do you imagine it goes when the content creator gains a lot popularity? Do they raise their price for all distributors? Then do the distributors have to forward that price to their users, or can they do what they like? You mentioned having their own pricing model, so again Netflix could buy content from a popular artist at a good price, but provide it "for free" to their subscribers (in which case, again, that's the system we have today).
TL;DR: I don't see how that can work. Even with smart contracts (which are known to solve most problems /s).
I was about to write a similar post. I think the only way it can work is a distributor paying a fixed price for every user that views the content. This way both big and small players can have access to it and you can even imagine some pricing it higher than others if the overall experience on their platforms is worth it for the users.
The author sets the price for every bit of content they offer. They can set it separately for every bit of content they offer or even change it after a while (although that will likely require some waiting period as without that promise buyers are unlikely to commit).
The problem here seems to be enforcement and accounting as there would be a big incentive to not report the number of users in an honest way.
We already kinda have that with FRAND for patents. That still has its issues, but the idea is workable.
The main question is what you want to prevent. For me the answer is "the stuff you want is spread over 15 different subscriptions". Preventing that was the main selling point of netflix or steam over piracy.
I suppose you need to enforce that all the distributors pay the same price for the content (otherwise again, we end up with the system we have today, where some distributors can pay more and get some kind of exclusivity through that).
Then how do you imagine it goes when the content creator gains a lot popularity? Do they raise their price for all distributors? Then do the distributors have to forward that price to their users, or can they do what they like? You mentioned having their own pricing model, so again Netflix could buy content from a popular artist at a good price, but provide it "for free" to their subscribers (in which case, again, that's the system we have today).
TL;DR: I don't see how that can work. Even with smart contracts (which are known to solve most problems /s).