Bitcoin is a special type of Ponzi scheme that uses energy input from miners to create the illusion there is a return in value over time. Like Rai stones, immutability comes from the work and risk, but the value of the object is itself held in the population's mind. This only "works" if everyone agrees it works. If everyone agrees it doesn't work then it doesn't work and isn't worth anything and the risk taken to "make" it is lost. This is why an allegory can be told that indicates it is the faith in such an object that brings it value.
Without enough people using said blockchain, it is both worthless and empty of meaning - no different than a scrape in the mud. A killer use case for crypto will make its utility valuable and inventible. A road is formed from wear of people agreeing the road goes somewhere.
The danger is the requirement for increases in power to the network, which both drives and is affected by the current value to fiat. We may yet wrap our planet with solar to drive our economic desire of "wealth".