You think so? What's behind that thought? I see it as a great boon to the small printing houses because their costs for limited runs will be very low compared to gearing up for putting words and graphics on paper. Once through the editing process, small printing houses can now move directly to selling the textbook.
No longer a need to go through the pre-production run, the hard copy proof-reading, corrections and then doing a short-run of printing. This way they don't need to store copies until they are sold, pack books for shipping, invoice, collect and disburse royalties, send out advance copies, etc.
Once the professor signs off on the edited copy, it goes right to Apple's iBookstore and the money rolls in.
Exactly, the print house with the paper press iron and the layout house are very rarely under the same roof these days. This is a boon for typeset and layout people, not those running the printing mills.