Who's fault is it for a University student not paying attention because he's to busy playing on his tablet than using it to take notes? I know this, but like the OP mentioned, it saves paper, and another posted how it saves from carrying a ton of books around.
If I could carry all my books in my iPad and do school work from it, then I would.
It also attract crime, and unlike textbooks, can be expensive to replace. Also, what it saves in paper is just consumed in energy. What benefit is that?