I'm kind of with Aaron on this... making prints so you can scan them at some future date, as a form of backup, like some sort of negative, is a cumbersome, slow and not-very-high-quality way to go. There are lots of easier ways to save digital files.
That said, I do agree with the OP that digital files are inherently temporal. Most digital images will inevitably be lost over time, in spite of well-meaning efforts to retain them.
With that in mind, I would certainly make physical prints of any images that one feels are important. The difference is that I would intend those prints to be final versions of a picture, not a "negative" from which the image could later be sourced. And with that as the intent, I would argue for using whichever paper/ink best serves each individual image.
