Paper money will last a very very very long time, it's going no where and believe it or not 99.9% of human likes paper money, they like to be in control and paper money make one feel in control.
I think that it's not about control, but how much easier it is for a person to use paper money and to make purchases and sales of different goods. For many people, the crypto currency is out of reach for today and all because of the lack of knowledge and certain technologies.