I think real money in the future will keep up with the times and technology so that it is more practical, fast and efficient, and it is the same as the nature of crypto currencies and all will be digital
I don't think anything would be exclusively digital even in the future. There will always be the need for something that we can physically touch and hold even with n advanced society's standards. So the digital age may advance and make things easier for us but real money will always be a necessary option.
It feels like system must be changed. People must change themselves to adopt this spectacular coin and countries must accept it and adopt their systems. Modification would be need of time.