The dead tree book isn't going anywhere soon. That said, I can see entire classes of books disappearing over the next two decades. Novels and certain types of non-fiction work well with electronic readers.

Here's are few thoughts:

Printed books have been around for centuries, so they are more of a cultural phenomena than a technological one. Technology is easy to change. Culture is not.

The media that have changed a lot technologically (e.g. recorded music) have always been technologically mediated. To stick to music, you will notice that the instruments haven't changed very much over the years. New ones come and go, but the old ones are mostly still there.

Print is still more convenient for certain types of books. That will change over time, but there are still big hurdles: resolution, battery life, etc. aren't so great for very visual texts.

Business practices have been slow to adapt. We are at two extremes at the moment in electronic print media: "free" (in either cost or liberty) and "non-free" (no cost benefit to electronic texts and a lot of our freedoms are gone).

Perception is an issue too. Print has a sense of permenance. Non-print does not. And there is good reason for that.