I wouldn't think you would need more degrees. I think that some hospitals do seem to put nurses in administrative roles, but I don't think that is the case with more specialized psych treatment programs such as eating disorders. I also think that psychologists are some of the best qualified to run these types of programs and oversee the delivery of services, supervise clinical staff, evaluate outcomes, provide guidance for legal and ethical dilemmas, develop new programmatic elements based on current research, and I am sure others could add to the list. For some reason, I don't think psychologists put themselves in these leadership roles enough or don't recognize the skills that they have which will apply.