As someone else said, a lot of grads aren't getting positions and its a national issue. Nurse shortages usually relate to a shortage in senior experienced nurses. Kinda hard to get experience if you can't get a job though...

Once he has done his grad year, he is not likely to have trouble getting work in rehab. It's an area that struggles to retain staff for various reasons. I know my old work pretty much has permanent vacancies in rehab.