Due to its instability, I don't think that will occur. With government and central bank-developed instruments that help with regulation and its impact on an economy, fiat currency has shown to be a trustworthy medium of exchange.Nobody knows and examine the potential roles that cryptocurrencies will play.
We do not yet know what would happen to global financial stability if cryptocurrencies were to replace fiat money.
In terms of people's use of cryptocurrencies, bitcoin has almost become a global currency. But it will not be used as the state's world currency. For them, this is simply unacceptable. They fully embrace blockchain technology and create their own CBDCs based on it, which will replace their need for digital money. Therefore, a decentralized cryptocurrency is the currency of people and for people, but not for settlements between states.