It could be in future . The way bitcoin are growing in the world we can dream that as a universal currency. But it is so tough cause still we have lots of news to ban bitcon in few countries. We have need more knowledge on bitcoin and spread it whole over the world, gradually the result will come .I hope so ,we will see bitcoin as a universal currency in the future.
I think bitcoin can be a universal currency, because people in this world need digital payment tools that are fast, easy, cheap and safe. As an option other than fiat money, bitcoin applies technology that cannot be rejected, especially the upper middle class who already understand technology.