Digital textbooks can offer so much more than print textbook
There's no digital interface as fast or intuitive as sticking a finger in a page to flip back and forwards, or scribbling in a margin, or any of the other ways that people physically interact with books. Maybe there will be one day but reading a PDF on a screen doesn't even come close.
I hate buying text books in electronic form. I still more where or less to find the equations I am looking for in the 1300 odd page Gravitation by MTW, yet zooming back and forth in even a small pdf is an exercise in frustration.
There's no digital interface as fast or intuitive as sticking a finger in a page to flip back and forwards, or scribbling in a margin, or any of the other ways that people physically interact with books. Maybe there will be one day but reading a PDF on a screen doesn't even come close.