Have you ever heard about the "One World Currency" that will be used in the New World Order? Well, it's believed that such currency may be powered by a blockchain which is in the hands of Banks and Governments worldwide. As this technology has been proven to provide borderless payments in a fast and cheap way, it's the perfect way to upgrade the existing monetary system into one that's highly efficient, transparent, and controllable by the world's authorities. In addition, blockchain not only works for tracking money, but also property, supply chains, and more.
As such, there could exist a global currency in the future which makes use of Bitcoin's blockchain technology. After all, the latest buzz has been all about blockchain, and banks, as well as governments, have become interested in it. Before we know it, everything will be digitalized as our personal, financial, and medical information will be stored in a microchip and verified by one global blockchain network.
What are your thoughts?

Most governments use the local currency as a tool. Inflation helps them a lot. Issuing "paper" also helps them a lot.
If two or more different countries want to use the same currency they need a lot of regulations and even then big problems can occur (see EURO and Greece).
So no, I don't expect to see too soon such a coin.
Commercial Banks, on the other hand, could use some sort of digital gold - a cryptocurrency they manage / own and can transfer value between themselves very easy. This could be something we may see in a near future. Such approach makes more sense.