I work in Web3 and I would say cryptocurrency as a "currency" / speculative asset etc is a failure.

However, the underlying technology is legitimately interesting and solves a lot of hard problems (e.g. distributed systems, consensus, clock synchronisation across wide networks, provable ownership of assets, etc, etc).

I don't see any value in the coins blockchains operate on except maybe as a means for paying for execution on that network.

I do see a tonne of value in say, abstracting something like USDC payments/remittance/etc that runs very cheaply/quickly on (for example) Solana and remove middle men from these equations.

I think the market/world will optimize out of the un-interesting parts over time and the use cases that add value to the world will rise to the top.