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.
It is a good thing that people has started seeing the goodness of the digital currency. I always say that once the superpower countries or the first world countries have accepted the bitcoins, it will be easier to roll out to the rest of the world. I do think the reason why it has been a challenges for the growth is because at first bitcoin was tainted to have been used by criminals. I also hope that the coin will be the new mode of currency in coming years.
It's funny because I was rather thinking that the lower-income countries would be the ones pushing for bitcoin. They have more economical problems which could be solved by using bitcoin (inflation, unsecure banking companies and so on), so it would make sense that they have more incent to use it.