It's quite widely accepted now - certainly in the professional circles I frequent - that:
A)Service Delivery Management is something you get to after 5-7-10 years of previous experience - variable based on exposure and competence.
B)The best SDMs started out on Service Desks, and then work their way up through other functions. So they actually understand what the hell is going on due to experience. The theory only takes you so far.
Whilst I'm also PRINCE2 Practitioner level, I wouldn't even consider being a Project Manager. Anyone fresh off the Uni boat who thinks they could do it without earning their stripes doing some PSO/Work package Mgmt first is having a laugh..... or they are 'Project Managers' in nothing other than job title.
Reality is, University isn't a guarantee of anything. When there is such huge choice, why would you consider anything other than the best you can get with as much experience as possible. For many roles, doing University at a later date to aid career progression is a far better path.
Edit - BCS seem to agree with me on the SDM bit -
http://certifications.bcs.org/upload/pdf/service-mgt-careerpath-full.pdf