First and foremost, it will be nearly impossible to get rid of cash completely. Cryptocurrency has a good potential of improving the entire global economy but for the adoption of it might take a very long time for the entire world to accept the use of it. The online nature of cryptocurrency makes mass adoption very slow. Personally, I think crypto developers should find a way they can integrate both cryptocurrency and cash together to further enhance the massive use of cryptocurrency in the financial ecosystem. With that, there can be some possibilities of getting rid of cash completely.