I don't think that paper money will be used in the future anymore, since producing paper money is impacting our environment greatly, paper money can be faked (technically) while cryptocurrency is almost impossible to be faked on. Cryptocurrency is also a safer alternative to paper money. I think we will see this starting to be introduce in around 10-20 years because the community who doesn't understand the beauty of cryptocurrency will refuse it to be implemented.
In the future, there maybe a cryptocurrency that is going to replace our traditional stock.