I've heard recommendations, here and there, that professors assign more academic monographs to help sustain the academic publishing market. That's well and good for graduate classes, although I'm a little amused by the idea that the faltering academic publishing market is going to be saved by the flowing coffers of graduate students. And sure, maybe you could assign a monograph or two in an advanced undergraduate course -- I remember people doing that at my undergraduate institution.
But my existing need is not for a way to assign more monographs to students. Monographs are easy and, compared to science textbooks (or a Kindle loaded with e-books), cheap. It's also pretty easy to assign many journal articles, thanks to Project Muse and JSTOR -- you can just link from the course web site.
It's book chapters that are annoying to assign. They always mean time spent copying and/or scanning, and the end result is a poor-quality facsimile.
I would like it if all the university presses got together and offered high-quality pdfs* of individual book chapters for sale (cheap), iTunes-style. I say this not because it would save the academic publishing market but because it would make my life more convenient. I could assign a chapter from a book, the students would pay $.99 (or whatever), the publisher would see a tiny amount of money, and students get a readable, easy-to-access copy. I am sure there are big holes in this plan that would make it unprofitable for publishers. I don't know if everybody wins in this scenario, but I sure do.
*I know that a lot of people would say that pdfs are a mere vestige of print culture and should be done away with as the universe moves toward a dynamic e-book model. To me, the fact that pdfs are a vestige of print culture is precisely the advantage. You can print them, and then read them! On paper! They display correctly every time! Pdfs are the mp3s of text.