I completely agree that crypto will be the currency of the future. Cryptocurrencies are already used all over the world and constantly more and more countries begin to legalize cryptocurrencies and recognize them as official currencies, this is just a matter of time when the whole world will already fully begin to use cryptocurrencies with its full potential.
It may be called something else and it might be something that don't still exist but the future is certainly of blockchain based currency. Not only are they trustable, they are more transparent and efficient to circulate and maintain. Many nations have already jumped into blockchain based currency for both digitization of fiat and introduction of entirely new finance system.