If all countries can accepted crypto currencies in there various countries, as a means of payment and as a means of online exchanges, such as money is, money is anything use as a means of exchange and general acceptable. With the means I think all cryptocurrencies (bitcoin) will definitely go round the world, and will be use as a means of exchange. I will be so grateful to the creation of crypto currencies. This will also help our future generation, Remember something when we do international transfer across the countries, it may take a while to get the money to your local bank account, but with cryptocurrency you can get instant reflection if bitcoin etc is transfer to wallet,And you can make use of your coin (bitcoin ETC).
It would be a great way to introduce Cryptocurrencies to the public in that way but it would be adopted faster if one country would try a test run with it. A country that would take the risk of adopting it in a public manner which would enable their communities using it on a daily basis. They should also try and teach it at universities and companies because it would boost the credibility of the Cryptocurrency that they will be using.