It's a novelty in search of a use case.

True, but I think blockchain technology in of itself has use cases. Bitcoin, Ethereum and co. can go ahead and die because they're useless but the underlying technology is essentially a distributed database with built-in transparency mechanisms, meaning it could be used to facilitate for example state bureaucracy. You'd also make looking up and validating info etc way easier. I don't think it's an absolute necessity for a well-functioning state but it could have its uses.

What most cryptobros are peddling unfortunately is not that but rather pyramid schemes.