With the fast developing blockchain technology, more and more people are getting involved in the blockchain world. The human being has been evolving so many years, we went through the period of the primitive society, the agricultural revolution, the industrial revolution, and the Internet revolution. It's time to change, we now need to enter a new era, a decentralized era, we got to trust each other with the technology, but not with the third parties. Government is third parties, the bank is third parties, all the giant company are third parties. Why they want to hinder the development of blockchain or ICO. Because they are afraid, there are no more people they can get benefit from.
That is why this ia not likely to happen. Some countries will not approve to this. And there will be so much changes to go through before this. Current technology may be able to support this. But not from now. And if it is likely to happen there will be a unified currency throughout the world.