I can see this going round in another circle.
The key skill for creatives (in any medium) will be marketing. Being good at the thing you do is table-stakes. Being good at marketing to create the audience will be the key divider between profitable artist/musician/writer/etc and aspiring amateur.
So there's an opportunity for a good marketer to find a great creative (or vice versa) and strike a deal that allows the creative to focus on creating.
This is basically what publishing houses & record labels do, but they're still so caught up in the actual physical production of stuff. Now everything is digital there's no actual need to make books or records.
There'll be a new set of "promoters" who handle the hottest new talent. Getting signed with one of them is the guarantee that you've "made it" and you might actually be able to make a living from this.
Then the promoters will be publishing their own collections of stuff, or creating their own subscription services, or finding some other way of cross-promoting their creatives to the audience of the other creatives they manage. Then it becomes a matter of choosing which promoter(s) you want to follow.
And then we're back to where we were, with gatekeepers for content.