Honestly...... 3.0 is actually dead on arrival thanks to the proliferation of "Web3" the brand damage is done and "3.0" should find a new name ASAP.

Imo Web 3.0 is Webtransport / Webassembly / WebGPU. But Web 2.0+ may be a more fitting name.

Wikipedia uses Semantic Web: https://en.wikipedia.org/wiki/Semantic_Web

They really don't even distinguish between Web3/3.0: https://en.wikipedia.org/wiki/Web3

I was thinking that web 3 would be fitting for ActivityPub, WebTorrent, Namecoin and IPFS.

No? ActivityPub is a protocol over HTTP - that's solidly last-gen. IPFS is caught between iterations but IMO is solidly Web2, and WebTorrent/Namecoin are abstractions over pre-existing technology. I think that's appropriate for a Web2.1 starter-pack, maybe.

What's next-gen is the federation, as opposed to the centralization of the current-gen. HTTP has nothing to do with it, even the "semantic 3.0" didn't ditch it.

That's not next-gen. Federation has existed since the 90s in the form of P2P trackers and other networking paradigms. HTTP has everything to do with it because Mastodon is built on a client-server model (not a peer-to-peer one) which is the textbook definition of a Web2 network.

When web 2.0 entered the picture, it didn't bring in anything new either, but represented a different focus. I think my proposal makes sense as "3.0" because similarly, there's not much new except a new focus in it.

Not very many people make this distinction… As far as optics and media perception (which is unfortunately what matters for the cultural zeitgeist) most understand Web3 to be the next generation incarnation of the web.