I don't think it's a bad thing. We treat VCE students like capable adults and respect their choice to choose what they like but then we backhand them for fluctuations in demand in the subjects
we like? Fundamentally, they didn't choose it because they didn't want to do it. You can argue why but thats the short and skinny of it. So it might be that the school didn't instill enough love for math or science or something like that but shock horror, not everyone does or will like math or science. It would be a fairly hefty chunk of kids as well.
Maths should be compulsory, it's used in everyday life and improves problem solving skills.
Not sure about science though, always hated science.
Basic arithmetic and algebra maybe. Beyond that, most people wont ever need to derive the area of a football field or the speed a rocket is heading at tasmania jones. I think you actually have the potential to push kids out of VCE if you make it more restricted and mandated. The current system is an advantage because you can do more or less whatever the hell you like.
Bit of an irony between your top and bottom sentences too :p.