I’ve been reading eBooks for years. (I’ve just realised it’s almost a decade! God I’m old.) I’ve used various devices, and whilst I love the convenience of electronic reading, it’s not killed my love of printed paper books. I like them both, they each have their pros and cons.
In contrast, the number of CDs and vinyl records I’ve bought in the last few years has to be down in the double digits, and I buy a fair amount of music. I’d be the same with movies etc if it wasn’t for the fact that I have a lousy DSL connection and it would be a massive pain to download digital video regularly. The difference is that you need a CD player or a DVD player to use those things, and when you have a computer you can just cut out the middle-man and go directly digital. A book, though, stands by itself. All you need is your eyes and (unless you’re reading Dan Brown or something) a brain.
The unit cost of printed books will probably go up over the next few years due to reduced demand, and there will probably be far fewer titles available, but I don’t think the book will go away completely in the way that, say, magnetic cassette tapes or floppy discs pretty much have, and the way that CDs and DVDs will. The book is far too elegant an invention for that to happen.