I cannot rule out the possibility of paper money to dissappear but it will take more than a century. Most digital currencies including Bitcoin are still in the middle stage and therefore cannot make paper money to dissappear so quickly.
I agree with you. Bitcoin is only at the implementation stage and he has a great future. But for the time being it is becoming popular, Fiat will be used more than the crypto currency. I agree, 50-100 years will still exist paper money