From McArdle's post:
The fundamental issue in the academic job market is not that administrators are cheap and greedy, or that adjuncts lack a union. It’s that there are many more people who want to be research professors than there are jobs for them. And since all those people have invested the better part of a decade in earning their job qualifications, they will hang around on the edges of academia rather than trying to start over. Such a gigantic glut of labor is bound to push down wages and working conditions.
Unfortunately, I’m essentially arguing that professors ought to, out of the goodness of their heart, get rid of their graduate programs and go back to teaching introductory classes to distracted freshman. Maybe they should do this. But they’re not going to.
Labor markets, even in academia. Life is tough.