Two Year Degrees

The 'students' at my local University are just finishing their exams at the moment and the next academic year begins at the end of September.

As we hear constant (and often justified) complaints about the level of debt that students end up with and bearing in mind that most of them aren't exactly overworked during the six weeks or so of the year when they do actually have lectures; why oh why do we not just compress all the non serious subjects into two years?