Yeap, I sure see people lining up to use those copy machines in the library. Well, except I don't. If you're doing anything other than copying a few pages for research purposes (which is usually covered under fair use/fair dealing provisions) it turns out to be cheaper to just buy the thing. As for media, it is possible to view or listen to it in a couple of hours and libraries usually give you a week to do so. So why would you want to violate copyright law?

I highly doubt that libraries have a negative impact upon copyrights. If anything, they would discourage people from violating copyright laws since legal avenues are available to them.