Yes. History is littered with currencies that failed and are no longer used, such as the German Mark during the Weimar Republic and the Zimbabwean dollar more recently. While previous currency failures were often due to hyperinflation, which is impossible with Bitcoin, there are always potential technological failures, competing currencies, and political issues. The bottom line is that no currency can be considered completely secure from failure or difficult times. Bitcoin has proven to be reliable in the few years since its inception, and there is great potential for Bitcoin to continue to grow. However, no one can predict what the future holds for Bitcoin.
