Look, I think blockchain can basically be seen as a public, distributed-trust ledger. It's not like it doesn't have any kind of social precedent, the concept of a "ledger" has existed... throughout all of modern civilisation? I think the decentralised and computation-oriented nature of blockchain has some interesting uses, but let's not pretend we didn't previously know what a ledger is.
Pretty much all of the things listed in this page under "Web 3.0" are things we already do. Blockchain might eventually lead to new ways of doing these things, but let's not pretend it will CHANGE EVERYTHING, it will just allow to do these things, maybe, a bit more efficiently and with more trust. Maybe.
Sigh. Sorry, already getting a little tired of the utopian predictions starting to be promoted by techno-evangelists jumping on this bandwagon. Enthusiasm is good, hype gets old quickly.