Maybe the humanities need to change and that's the problem, but looking at those graphs in the article it seems that the answer is "it's the economy, stupid." When I was in High School we were all told that it didn't matter what you majored in so long as you got into a good college. Maybe kids now just have a little reality built into them, that jobs don't come free with a college education, that it's possible to take on more student debt than you can afford with your job opportunities. And maybe what's happening is just that fewer kids are getting duped into digging themselves into debt expecting they'll have a career at the end of it because they followed their passion like everyone told them was how you get successful.