I've had a thought. (quick, note it down in the diary) Given that I write pretty regularly in all sorts of forms, it's actually quite a weird one. A few hundred, or thousand, years from now, assuming that we haven't all destroyed ourselves, it's entirely possible that the written word won't exist.
It sounds odd, doesn't it? But think. What is the written word? It's a tool for communication, specifically for the preservation of words so that the presence of a speaker is not required. As natural and eternal as it seems, it is, moreover, an invented tool. Given time, it could become obsolete.
The glimmerings of the mechanisms for such a change already sort of exist in the form of advanced telecommunications and cheap digital video. We are in a position where we can record language in it's spoken form without the additional business of a squiggle on a page. We could, potentially, reach the position where every newspaper's online podcast takes over from their print run, where every post it note gives way to a little recorded clip, and where everyone who thinks that 'books are boring' finally gets their way and only the visual media remain.
Ok, I'll admit this is a pointlessly out there bit of crystal ball gazing, but it could happen. Not any time soon of course, but eventually. After all, there were probably people who thought this 'printing' stuff would never replace caligraphy. It hasn't, not completely, but when was the last time you hand wrote something for public consumption? Handwriting has become the stuff of love letters, scribbled notes and shopping lists, where once it was the only available technology. I really hope writing as a whole never goes the same way.