You talk about "useless degrees", and their inability to get you jobs, but then again, do all "Scientific" jobs really need degrees? Many people managed just fine 50 years ago. My Granddad was a draughtsman engineer for a factory who didn't have a degree, he simply got an apprenticeship and managed just fine. My great uncle was also an Engineer working for a major car manufacturer who also didn't study a degree, and he managed brilliantly too, (though he was awarded an honorary degree at the end of his career).
The thing is, why should people be forced into studying subjects that they feel they either wouldn't enjoy, or simply aren't skilled in? If someone is a talented artist, writer or musician, why would they choose to to study Physics, Chemistry, Maths or Economics, if they feel those subjects aren't in their interests?! If every University student were to study a Science, I highly doubt there would be enough Science-based jobs to go to all graduates, making your argument invalid!
An arts degree can be very time consuming and challenging, so you have no right to speak down on them, at least from decent universities. Yes, I sort of agree with you within the context of what people might call "Mickey Mouse degrees" from many former Polys, i.e Golf Management, History of fashion or David Beckham studies, but that's surely what apprenticeships should be for? If no one were to ever study an art or humanity again, then the world would lose its history, mapping skills, and skilful novels, art and music. All in all, a world where people are dull, Science-obsessed drones.