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.
What amazing things to the world and financial sector would the benefits be apart from faster and easier sending and receiving of money? I hope there will be a more specific answer to the question as I am also intrigued by it. Everything seems to be going digital nowadays and I am sure that in no time currency would follow if not this decade but most probably in this century.