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 it's not a problem, first everyone in the future will definitely use the internet and then bitcoin can be used anywhere to transact. No matter the country is far away in the world. They can still send money in that country to any country in the world, and that includes global currency