This question implies a number of myths.
- Electronic texts do not save students money. The price of textbooks maxes out at what the market will bear. This is true whether they’re electronic or physical.
- Electronic texts are less convenient for some purposes. E.g., taking notes.
- Electronic texts aren’t an appropriate thing to allow as “open book exams”, because devices that can read the text can also browse the internet.
In short, electronic texts are not a panacea.