I think for that to really happen you need to go to like an 80/20 curation split, 50/50 doesn't seem 'enough', don't you think?

Possibly. That exact question has been debated by stakeholders, witnesses and devs. We're trying 50/50 + 25% downvotes + a curve for now, where the latter two are seen as reducing the necessary curation share somewhat. Maybe enough, maybe not. If that doesn't work then we'll need to iterate in some manner.