@wowfood: Does what they are doing now matter when they may have studied the subject because it interests them which I always thought was the main reason people went to college or university (apart from the drinking). It'd be a pretty shit world if people were only allowed to attend college or university on the proviso that they have to guarantee having a career in the subject they want to study. Besides I suspect most of your friends won't stay in those jobs forever and will find better jobs, perhaps ones involving their field of study.
@AC: Bollocks. Almost all of the people I know who studied arts and humanities degrees in the past few years are paying back their student loans at higher rate than they have to, much faster than my friends who studied IT or science at university as a matter of fact. I suspect that is because they have less of a tendency to piss their money away on shiny gadgets or online gambling.
That doesn't include those that saved up from part time work as a teenager or ran their own little businesses at that age to generate enough cash to go to university naturally.