I predict that one day digital currency will replace paper cash within a decade.
Someone can be think that this prediction is mythic given the slow adoption of the electronic currency.
But, all sides agree that digital currency will have an influence on the fiat currency systems of the world.
If we are talking about the means to which we use currency, then yes, paper money will be replaced by digital currency.
As our society becomes increasingly dependent upon technology, digital currency will become a more popular means of paying for products.