The same as it does now, but with even more AI slop.

Instead of ~6500 SCP entries, there will be significantly more. If humanity goes on long enough, eventually every single thing and concept will be transformed into an SCP.

I'm going to guess... meta-fictional-wiki that is almost a parody of other collaborative efforts that slowly gets more horrifying, not because of the articles, but because the contributors slowly get more unhinged/ fantastical.

It'll be cool while theres about 20 or 30 people who know about it, then the moment it gets popular enough to be a known thing It'll be absolutely swamped with AI and nobody will want anything to do with it any more

"It was a dark and stormy night on the internet..."

I think the life cycle of collaborative projects - small circle to big blowup, drifting from the original spirit or ethos for better or worse - will be accelerated by algorithmically-driven social media. Hell, it's already happening.

When I look at older collaborative fiction, it's much more likely to remain centered around a few core creators and their guidelines or approaches. The more content in a project is owned by them, the more they're able to influence others to not diverge too far from it.

When things blow up massively, that can all change in a heartbeat. Whoever is running the project frequently struggle to maintain those guidelines: Either because they don't want to seem like controlling jerks, or because the flood of new content genuinely overwhelms their ability to moderate.

The problem is, this accelerated lifecycle can also burn out projects far more rapidly as people become disconnected from what appealed to them in the first place.