If it were the case that the main currency of every country in the world is Bitcoin. Then how do you think the world economy would be run? Because when Bitcoin becomes the main currency, the American dollar and other countries will have Bitcoin as their main currency. The local currency of that country will be associated with it as the second currency. In this case, how would Bitcoin be used or how can it play a good role in the world economy?
Volatility will be the order of the day and government policies and regulations can't control it so it's going to be a hard nut to crack honestly. Yeah we are optimistic to see that happen but looking at the rate at which the price tend to change and affect alot of things I think it's not a good idea to have Bitcoin single handedly play the role of the main currency of the country or the world.