Have always wonder which currency would the world accept if only one currency was to be used. Maybe the dollar?, don't think so, The British won't tolerate that.
Cryptocurrency?. Maybe. Until the advent of cryptocurrency, I never thought that would be possible but it seems possible.
The world is not too far from a unified currency.
Nope. I doubt we will ever be able to use a "unified currency". It is not just possible. Different countries have different problems. Problems of their own. Think about how big of an issue it will be because of inflation. How much of a mess it will be to print money. It is just not going to happen.
Those that are saying bitcoin is a good option, how? Bitcoin has its own problem and flaws too. And no way any government would allow a decentralized currency to be the main currency of their country.