How exact are we getting? I'm an "assistant term professor", but I'm not an associate or tenure-track position, nor am I an adjunct. So i imagine if just people in my middling position disappeared, we might be fine, a bunch of adjuncts get a raise and a stable job, universities might have to reduce admissions or pack their classes, but we'd probably be fine in the long run. If all college professors disappeared, though, society might collapse. Suddenly you have millions of college students with incomplete educations who need to go somewhere. The brain drain on the world would be immense, and with the death of university-led research, we'd probably enter a dystopian future where all new research is being done by corporations.