I went the other route, I did a trade and also did extra schooling at TAFE while also doing my apprenticeship, now after completing my trade I've left to go back to full time school and I'm trying to enter university through climing the TAFE ladder, I'm pretty much one level out from university at the moment.
I think when you finish year 12 they shouldn't allow you to go right into university afterwards, no one knows what they want to do, what they are good at (besides school subjects) and a lot of people end up in university because their parents and careers advisors pushed them or the universities promoting all these courses trying to attract people into them even though they know there are an oversupply of graduates in that field.
Maybe get them out into the real world for a little bit first, get some employers to take them on in different fields as work experience kids or something so they can find out where their stengths are follow up on it rather than going a particular way on advise from someone with a vested interest.