I would only be worried about fastballs, like, "This OTHER case pertinent to this topic, but which isn't part of the required reading is in your book on page blah blah."
My same concern regarding the idea that you can take your casebook apart and just bring the pages that support the current week on the syllabus.
Although...our big Xerox here at work will scan docs into pdfs. So, if you're taking a casebook apart at a Kinko's...what's to say they can't run it through their big scanner? No clue about the cost though, but you'd still have the hard copy and digital ones.
Yeah, I'm not quite sure how to work around it. =/ Seems like it's either the whole book or bust, to be safe. Le sigh.
I can attest to this not being workable from experience. I used a X41 tablet this past year and the best solution (to me) seemed to be scanning those pages that are essential to your brief, OCR'ing them, then cut and pasting the text that you need. When you are using a "plug in" type of template along with Onenote, this becomes a very workable solution.
We were also very lucky to have professors who would send us PDF's of cases outside the assigned readings out of the casebook. These were very markable with programs such as PDF annotator and Bluebeam PDF - the latter more useful IMHO.
I'm typing this on my new Macbook Pro. Obviously, my love for tablets didn't last. Not becuase they aren't useful (they are) but because in nearly all of them there are some real performance sacrifices that are made for the sake of battery life. This is what killed my relationship with my X41. The X60 tablet is in a much much better position however, to be your fulltime "notebook."
Feel free to PM me if you have any questions.