The market will return, he might have to look at other jobs if he can in the meantime. Hopefully one that is in some way linked to the degree. He is not the only person graduating into a poor job market.
The important thing to remember is that the four years are not wasted. He is more employable already, in any field, simply because he has a degree, and the experience itself would have been a good one to have. So try and keep positive about it. Keep searching for jobs, don't write off the degree and remember that eventually he will get the job he wants. A lot of time it's persistence that makes the difference when people graduate!
In the meantime here is a list of related jobs:
http://www.prospects.ac.uk/p/types_o...lated_jobs.jsp