This isn’t talking about “wikis”. This is talking about an online encyclopedia of knowledge. I don’t want 15 versions of the “physics wiki”. I want one centralized source. So again, what does Wikipedia currently fail at that decentralizing it would solve? No one is stopping you from making an account right now and making edits.
What you’re describing about seeing updates is just an RSS feed.
This is just slapping “federization” on something that doesn’t need it because cool new thing.