I think this is a poorly worded question. First, if crypto couldn't be traded directly into cash, but could still be traded for something else that could be traded for cash (like fiat-pegged stable coins), it would still have value. Whether or not it's a viable alternate currency sounds very subjective. Some people would claim it could never have value.
From a technical standpoint, crypto will always have value as long as there is a network to process trades and two people willing to trade with each other. It's designed that way, so even if it was illegal, people would still trade each other for cash. The only way to stop that would be to sabatoge the networks that process those transactions.
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