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).
Indeed it would be very convenient to see cryptocurrency being available all over the world but still there are a lot to be considered before this may happen. We should take not that crypto is a decentralized currency which means there is no way the government could not have any control over it and it would end up having them gaining no benefits from it. Due to that situation, there's no way the government would allow crypto to regulate all over the world. On the other hand, not everyone is well aware on what crypto is and what it does so it would be best if everyone would gain knowledge about it first before letting it be a legalized currency.