James Warner imagines it. What 2080 will hold:
For the benefit of those people at future-of-publishing panels—there's always one, for some reason—who insist it's really not about the text but the smell of the book, books will by this time be available exclusively as lines of fragrances. Subsequently, humans will modify themselves into a species with a powerful olfactory sense, able to read underwater by decoding strings of pheronomes.
(Hat tip: MR)