Indeed, it just means that the really expensive thing that people put a lot of time into building turned out not to be as valuable as expected. The wealth isn't destroyed, it's being discovered not to exist; a vanishing mirage.
The relevant question is 'What is a custom Meta AI datacenter valuable for, after a hypothetical AI crash?'
Crypto -> LLM -> Repurpose Crypto Power Contracts to Feed LLM Datacenters -> AI crash -> Repurpose LLM Hardware/Power for Crypto ?
Would be curious if anyone has run the numbers on what LLM hardware capacity (including upcoming) would do to blockchains, if a big chunk were reallocated.