Leaving aside all the jokes about the term Web 3.0 there's a deeper thought in the article, something Nicholas Carr recognizes as well. It also has a lot to do with what Tim O’Reilly calls ‘harnessing collective intelligence‘, a key characteristic of Web 2.0.
Anyway, I feel all these thoughts and terms really do point at a logical evolutionary path for the web.
“Their goal is to add a layer of meaning on top of the existing Web that would make it less of a catalog and more of a guide — and even provide the foundation for systems that can reason in a human fashion. That level of artificial intelligence, with machines doing the thinking instead of simply following commands, has eluded researchers for more than half a century."