Worth noting that the term Web 3.0 was previously used to describe the Semantic Web, a revolution that seems to be largely dormant.
At least it still lives on in the metadata used for Google smart snippets, and it's used a lot in the life sciences, and on wikidata. I really wish it went further, but at least it's still useful for most intents and proposes despite the small ecosystem.
also 'semantic web' has become a bit of a loaded term.. 'linked open data' is now more commonly used (though this is a broader defined concept).
--> i don't think blockchain will be web 3.0 (or higher version numbers for that matter)
Web 3.0/4.0 might be The Decentralized Web, though