Mass copying that is not related to any of the categories in the act would not pass the fairness test the way it's been enforced by the Copyright Board and the courts. The Copyright Board has been pretty adamant that they'll only tolerate a certain level of copying before that last factor is violated.
Now, we have other factors, but it would be hard to imagine that happening. I think a court or a copyright board doing a full fair dealing analysis would take into account all of the circumstances.