I first have to say that I'm concerned when our colleagues are referring to faculty in institutions as copying in an unlimited fashion, because for everyone I've worked with, and everyone I currently work with, the goal with all librarians and faculty is to respect copyright and to minimize the amount of copying. That is, I think, the first thing.
If the belief is that copying is happening in a very irresponsible way, then your question really is key, but I think if we can at least consider the possibility that this is not the case, that it's not that people are looking to copy widespread. In fact, we are really trying to make sure we're not copying more than we should.... At the same time, I'd put the question to my colleagues that.... Let's say it was 5%. Are they saying that all the other trends that are happening in the industry wouldn't have had the same impact that they've had today? I don't believe that's the case.