Yes, because money is nothing more than a way to trade. Lots of other ways exist. Now, and in the past. Digital currencies are, in that way, just a new way to trade. Change goes slowly often. Maybe not now, but in 2-3 centuries yes.

But, in my opinion, just like trading goods (your car for my motorbike) of friends doing something for each other (you fix my car, I paint your house), I believe that people will always have different kinds of way to trade with one another. Digital currencies is a another and new way to do so.