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.
I dont think so, since bitcoin is a digital currency, every people in this must have Internet connection and gadgets as well if that happened. So I think it is not a good idea that paper money will be xtiynct just think about the people who dont have and still can run with techy world.
I think no matter the number of bitcoin users in the world, when you can use bitcoin wherever you are even though it needs gadgets and internet to access it, I think it's included in the global currency, because you can use bitcoins anywhere and in all countries, and you can also send Bitcoin anywhere to all countries in the world?