The moment all the countries convert to crytocurrency would be the beginning of many amazing things to happen to the world and the financial sector, the process sending and receiving funds worldwide would become very fast and easy, it would lead to growth of businesses and make life easier for citizens of the world.
Crypto currency was created with the purpose that you convey in your opinion and crypto currency was created using technological advancements and developments but certainly still requires a long process and time for my country