People in general don't like change. The oldz really don't like it, which is why the GB is still stuck in 1950 when it comes to most things.
I'm a techie but I definitely understand rather having a book in the hand than a computer device. Who wants to stare at a screen while reading for hours? Who wants to fool with little keyboards? Annnnd, if I'm into a good read, I want to be able to keep reading in the bathtub or the toilet or outside under a tree and not have to worry about battery issues or electric shock.