There's no play, though in the most develop cities where they have a good internet connection and digital currencies are widely used, they can't still beat the volume of money going in and out which are fiat, therefore let us not think that crypto will replace fiat because it's tantamount to saying that decentralize system will replace the centralized system, not gonna happen.
Agree. Crypto will never replace Fiat because of the way its designed. The lack of a central authority makes crypto entirely different from traditional Fiat as we know it. Governments will continue to patronize Fiat above anything else, as they want to remain in control over people's money. The fact that Fiat is backed by the government, gives people some certain level of "confidence" that the type of money they're using is completely legitimate. That's not the case with crypto though.
While crypto brings many benefits over Fiat, it'll always be one step behind it. The biggest issue of decentralized cryptocurrencies is price volatility. Serious merchants and businesses alike would prefer to deal with Fiat directly because of its stable price on the market. Even those who accept crypto, don't use it directly as they would with Fiat. Crypto is instantly converted to Fiat when a customer makes a purchase in order to maximize the merchant's profits as much as possible.
Nonetheless, I believe that both crypto and Fiat will live alongside each other for many years to come. Governments cannot prevent crypto from being used in the mainstream world, whereas crypto advocates can't prevent the use of Fiat. The decentralized and centralized world will be separate from one another, giving people the option to choose which economy they want to support. Depending on a person's needs, will be the type of currency to use for mainstream transactions. Just my opinion
