Yes I also think that bitcoin is becoming a worldwide currency and more people are interested to know about it, how they can treat it.
You can already say that the bitcoin is global currency because if you want to make use of it you will only have to have access to the internet. Everyone can make use of it so you could say that it is a global currency.
not everyone,what about those that have no connection, how can they use bitcoin? bitcoin is not a global currency yet, it need to be accessible by everyone on the planet