I'm sure the future of paper money will disappear, gradually be replaced by digital money and then cryptocurrency. currently many countries that try digital money like China, South Korea and Japan. If success will be followed in other countries.
The thing that must happen I think but paper money will be lost not directly but on a regular basis. little by little people in the world will be changed using digital money
The Probability is high. line with the times. rivalry and competition between humans become increasingly severe. we are required to fast-paced, bitcoin and blockchain technology will be helpful in the present and the future, especially for fintech industry. despite that bitcoin still have serious competitor, namely gold, because its price is also getting up. but it is not practical to carry around. I think bitcoin more had a great chance to replace paper money in the future.
a pshysical money or a paper money would always needed now or later , digital money would be an option for those people who want to make a transaction flexible, faster and easier . i never think that paper money could disappeared , and digital money the only currency that we would use in the future. nothing can replace paper money , both should be used contiguous.