you can't imagine the world without paper money, it is impossible to ban paper money for ever. do you know how many people are using plastic money and card?
I think this number is very small in comparison to the whole population. and virtual currency also being used by the small number of people. most of the people are feeling comfortable to keep or use paper money still now. regarding paper money, only security is the problem in order to carry out, but for me, still, there is nothing to be a replacement for paper money. so it will last for ever.
I can consider a card being plastic since it is really plastic, but when it comes to money, I wonder what country uses plastic money.
People are using paper money because it is the currency the are used to use, maybe if they knew bitcoin and other digital currencies, they will be interested to use them not because they are pretty efficient but also pretty volatile that can give them good profit in a short time.