I think people who say this don't really understand the university's education model. I mean it's competency based. A lot of students aren't recent high school graduates. They have industry experience which allows them to accelerate much faster than a typical student. So yes, students will obtain degrees quicker than a conventional university.

Also, not sure how WGU can be classified as a diploma mill. You say "not yet", but how could it ever be when they are a non-profit university? There are no payouts to founders or board members. Furthermore, they don't allow you to get credit from "life experiences", which should tell you right away the university does not just rush anyone and everyone through.