This is very possible. The Blockchain technology is a revolutionary one with a lot of significance. As the people become more familiar with it, the adoption and utilization of the Blockchain and cryptocurrency will increase which will gradually lead the world to cashless.
No, although the cryptocurrency will continue to develop for a very long time, it will not be decisive in financial relations either in business or internationally. It will mainly be used by private individuals and can never lead to the fact that our world will become completely digital. Although the cryptocurrency will take a serious position in society, it can only exist in parallel with the national money of the states.