It's too bad librians couldn't muster the mettle to pull a DMCA type of user-based accountability. I'm serious about this, as Fair Use does have significant implications when performed in an institutional setting, but by the use of individuals, it becomes much more easy to circumnavigate. One of the greatest misconceptions is the extent to which Fair Use applies - showing an entire video? That's not Fair Use except perhaps in a Film Studies class by a vetted Professor. Showing a snippet of a video as a point within a broader presentation or lesson? That's the goal of Fair Use.
Showing videos as a general rule is a Performance Right issue, not Fair Use. The DMVs in my part of the world routinely broke the law by showing Disney VHS tapes in the lobby. I'm talking for years, not just an isolated incident. That's not a Fair Use issue in the least, and lawyers, with respect to the law, could reasonably pursue compensation.
Are you familiar with "independent coffee shops" coming under fire from ASCAP for hosting open mic nights and/or playing AM/FM/XM/Internet Radio without paying official dues? The poor widdle coffee shop owners claimed it was extortion, or they tried to muddy the water with some kind of Fair Use claim, but they didn't have a case and I have to admit that ASCAP was abiding by their legal rights. Now, coffee shops are more diligent in telling people to play originals, not cover songs.
Overall, my point is that Fair Use is so utterly abused as an argument by people who don't understand Copyright, Performance, and other nuances of (wholly butchered / Disney-lobbied) legal channels that it genuinely hurts those who understand the concept. I routinely have to counter the argument that Weird Al is an example of Fair Use (as a general principle of using other people's music) because it's a very specific issue that he is legally allowed to do - Parody. Showing Bambi or non-Public Domain documentaries in the lobby of your library isn't Parody, nor should it be argued that way. Besides, if librarians can't find enough Public Domain content or educate students enough to assist them researching a project, then the job is effectively wasted space, and should be tossed out of conversation with respect to utility and necessity.