I’d love if there were different “layers” of meta discussion on top of everything on the web. Every blog and website would have an untold number of communities having discussions that are completely optional for you to view.
Instead of browsing across sites, you’d be browsing across communities seeing the same site.
Fun story. Way back in 2008, I tried to make it exactly that. I worked on figuring a way to inject the reddit comments onto any page. Sadly at the time the JS ecosystem just wasn't mature enough to allow users to log into reddit and safely inject it onto the page.
Disqus existed, but it worked because every page was completely independent. The discussion only existed embedded on the page.
Instead of browsing across sites, you’d be browsing across communities seeing the same site.