Cryptocurrency can replace FIAT in the future, Crypto cannot fake and cannot create more. This restricts frauds using counterfeit money, and inflation will not happen in any country that uses Cryptocurrency as currency. But it still has many disadvantages so it should develop in the future.
I agree, by looking at the future, I think crypto is a proportional currency to use later. but indeed it happened after many governments sincerely used a decentralized system that contradicted the current system