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.
In order for paper money to completely disappear, it is necessary that the digital currency works smoothly anywhere in the world, it is necessary to develop further in this direction.
i do not think that it is such an easy job that paper money will disappear completely, as in present time less than one percent people of the world are using bitcoin, i think it will take a long long time and even then people will be using both the option. to me i think it will take decades when all the peoples of the world will be using bitcoin in every corner of the world.
Not even in my dreams, we are thinking it is possible but we neglect to see how small we are as a community compared to fiat or paper money. It's true that we are growing but that in a bigger rate, we will never replace paper money as the government will simply does not gonna allow it.
Think of the majority, not all people are getting used to the technology, most of them rely on simpleness and paper money offers it.