To these people, I say fie.
I read copiously. Between my school readings and my personal readings I probably average six books a week. I have an iPad specifically because I'm not supposed to carry much weight, but broke grad student that I am, I get most of these books from libraries. I lug them back and forth every few weeks.
It is killing my back.
I guarantee you I would still spend time in libraries if I could get the majority of books on my (light) Kindle. I wouldn't object to there being a waiting period, the way there is when you have to pick up a physical book from a library. I am all for limiting the number of copies that can be checked out.
But I wish they were more readily available every day.