If and when cryptocurrency finally becomes an official global currency, how do you think it will affect the global economy and the economy of each countries? Will it help improve the economy better than fiat or will it still need help from fiat?
Do you mean like used by everyone and considered to be currency of each nation instead of stuff like dollars and euros ? Because that can't happen anytime, not now, not 10 years, not 100 years from now.
No money can be the official money of any country, they NEED to all have their own money. Even euro zone is having trouble for having one currency because while some try to fix the economy the others are trashing it and creates some type of resentment and anger between countries, look at Greece and Germany for example. Hence I think its IMPOSSIBLE for bitcoins or anything else to become a world currency... ever.