Digital currency is basically a threat to the old conventional paper money, as the world is heading toward the cashless society then paper money will surely feels its effect.
Indeed, the bitcoin has a good future because its digital with the paper money this is most likely the opposite it has a bad future because everything is gonna be digital.
I think the paper money will soon or later disappear.
The bitcoin has a much better future than the paper money because everything is gonna be digital in the future indeed.
I really think the paper money will disappear with some time, the increasing number of digital transactions is already growing with large numbers.