Unlike image files displayed on a monitor, prints are a physical thing. Each has individual physical properties like surface sheen and texture, and display choices like matting, framing, glazing (or not), face mounting on plexi, and the like. With visual properties independent of everything except a light source and a person's eyes they can be held, passed down through decades or centuries, and viewed as the author intended without regard for calibrations, the monitor resolution of the day, and the viability of a given electronic storage media type and file format. Prints also cannot be produced instantaneously in thousands or millions. Their individual physical uniqueness and greater immutability give prints a value, whether sentimental or monetary, that images on electronic media cannot have. It's a bit similar to the first edition of a rare book complete with dust jacket being worth gobs more than an e-book of the same title, or a note written on a slip of paper by your late mother being sentimentally more valuable than a picture of it on your iPad.
edit: Just to be clear, I think electronic display of images has its place and there are obviously countless applications. I just don't think either type of display supplants the other. I think each will continue to have its place for a very long time.