Here's the relevant data. From ten years ago, when I started at Wake (and Wake claimed all their classes were taught by people with terminal degrees):
http://ir.wfu.edu/files/2005_2006_factbook.pdf
And today:
http://ir.wfu.edu/files/FB14_15.pdf
Looks like there haven't been appreciable increases in part-time faculty in the last ten years, especially relative to full-time faculty. Someone with better grades in statistics help me out here.
Thanks for providing this information. I know some don't like the actual "number facts," but it's helpful and looks like there has been no change.