Paper money will be banned entirely?
How long do you think that happens?
would it work?
What security and privacy risks would it raise?
And how would public and privately issued monies interact?
You should think about how many people use credit or bank cards or mobile payment systems. If it grows paper money will start to lose reputation. Maybe 30 or 40 years later, there will be no paper many in the world. İmagine that all people uses mobile phones for payment.
A lot of people are still relying on paper money in their transaction so it will stay and we can only see a lot of choices and we choose based on our convenience.