No need to wait for the future. Nowadays, many people use cryptocurrency to buy something. Many types of digital currencies that can be used now to transact globally including cryptocurrencies but not to replace main payments.
People should really be thinking this way that there's no way that crypto could able replace fiat payments or system yet as long government does exist then
its really impossible to happen.
Crypto could remain and become popular but it wont really become mainstream on coming into the point that it would replace fiat
on general sense.
For now we are seeing that it does have potential but we shouldnt anticipate or hope that much.