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.
I believe that in the form as we now see and know cryptocurrencies, they cannot be accepted around the world. If cryptocurrencies are destined to be accepted, then most likely each country will have its own initial cryptocurrency. This is the more likely scenario for me. Well, the rest of the cryptocurrencies will most likely be used as they are now. For example, it is not profitable for countries to have a decentralized anonymous system, and I believe that over time, cryptocurrencies will be as centralized as possible and KYC will be needed for their use and trade. But as it actually will be, we will see for ourselves.