I think that is part of the job crisis problem: there aren't enough public or private research jobs, glutting the academic system with Ph.D's for which there is only a bit of space.

If you have any students thinking about a Ph.D. in the humanities, please send them to selloutyoursoul.com, a blog that tells the story of a grad student drop out and the danger of training for a Ph.D. when there isn't enough jobs to support them