Until I can go on holiday and spend coins its not a global currency, though it sure can achieve that within our lifetimes.
It's hardly a global currency when hardly any place around the world accepts it. We've got a long way to go before it achieves this title but it certainly has the potential but it's not going to happen over night. And USD isn't a global currency either. Sure, there are many countries that accept it or even have it as their defacto currency but I can't buy anything in my country or most places in Europe with it. In fact, I've probably got more chance of being able to spend my bitcoins over dollars.
USD is considered a global currency, because every central bank in the world keeps some reserves of it and usually import/export is being made with USD.
Do you have sources for that. I couldn't go to any of my banks and pay in dollars thats for sure.