I also took the survey. I'm also taking online courses and while I can see that some people would like to have e-textbook, I also prefer the physical kind so I can flag pages, fold corners, etc. This is particularly important since our tests are online. I don't highlight or do margin notes because I physically take notes on all of my readings but sometimes those notes will refer to "chart blah on page blah" in case I need details for the exams. I too get very tired of looking at a computer screen all the time. I'm also not sure I would be ok with purchasing a Kindle. I'm not convinced the cost of the Kindle is worth the savings for buying books. I'm also one who keeps textbooks for later reference.
All that said, I still think they should have ebooks available for those who prefer them.
Live with Purpose!