This topic reminds me a lot of the fear that "books" (as they are in there current state) will soon become redundant.
Many people have predicted that books in the near future won't be printed, but available on e-readers (Kobo, Kindle etc),
or as apps. And this has already started happening. For me I love a printed book, there's something about holding a physical object, with a weight and the satisfaction of turning each page. It's the same for instructions for me. When I purchased the Mindstorms NXT set a few years back, most of the instructions were on CD, and it was much more irritating (and worse for eyes after a few hours) than printed instructions...