True, it is further evidence of this trend that most librarians had known of, but I hate to say that my first reaction was, "Gee, you think so?". Specifically, they report that while off-campus use was about 45% of responses in 2004-2005, such use rose to 68% in 2010-2011. They do provide a few caveats, notably that the two surveys were using two different systems (a locally-developed portal in 2004/5 and SFX in 2010/11). This could easily account for at least some of the difference (how much would require extensive understanding of both systems). But I agree with the authors that the results reflect reality.
That being said, what does this mean? Is this good or not-so-good for libraries? I think most e-resource librarians would agree that it's good - use is use, and the more opportunities to increase that usage, the better. Does it mean fewer people are going to the libraries? Comparisons with gate-count trends could help with that.
Now, what does it mean for our community? Is our user community expanding? Or are they distributed much like the usage of our books - a Bradford-type distribution with a few heavy users followed by a lot of casual users? I wonder how they are benefiting from the use of these resources? Are they using them effectively? I wonder if they are getting jobs, good grades, learning new ideas, changing their outlooks?
"O so many things for me to wonder"