I think you still run into the problem that writers will vastly outnumber readers, so that risks turning the project into a write-only dumping ground. From there you have the same old discovery issues, where traditionally scientists relied on reputation as a first stage filter.
How do you build reputation in that environment?
Reputation is already a lot more about networking than a specific publishing system. Researchers get recognized by producing quality work and telling people about it in person, on social media, and at conferences. Reputation spreads by word of mouth. I don't see that changing much in an open publishing world.