How might the success of Bitcoin and other cryptocurrencies impact the future of international business transactions?

Do you think Bitcoin (or some other type of cryptocurrency) is likely to replace some of the major currencies such as the U.S. dollar, The British Pound, or the Euro in the next 5 years?

Do you think Bitcoin will have the impact that Bretton Woods system had on the world currency?

What are some of the obstacles that cryptocurrencies face? What strategies have been implemented, or should be implemented? Do some research about the technology behind cryptocurrencies, such as blockchain.