Because of the hold the medical schools/government has been with the admissions there will always be a need for doctors and yes that demand will remain high. I read somewhere that 60% of Australian doctors aren't from Australia, they're immigrants who graduated overseas that Australia is literary begging for.
Where they say they are increasing CSP places, its only a very very VERY small about. I mean every medical school has like an extra 10 places. That's nothing when compared to the growing population of Australia.
Medicine is one of those fields where if you graduate, you are 400% guaranteed a job.
Earlier this year I did a CSIRO science research scheme thing and my supervisor said two things
a) if you're going to do science then at the very least you need a PhD, that said PhD doesn't guarantee anything, I met a few of them still working as lab technititions
b) there are lots of job, but little funding, and as they go hand in hand... yeah
Science is an iffy field, very little security, met quite a few people who actually went back to CIT to do an IT course so they could get a job. In fact its only like 15% of people who start in the field actually still stay in it.
Also I was recommended to just do a normal science degree, if you want to do the same courses as medical science, you can you can do the exact same subjects just witout the title, however this leaves you room to move just in case you want to explore another field of science.
Plus if you still want to do medicine they don't look specifically for a 'medical science' degree, a close friend has an interview at Sydney for medicine soon and she did general science degree (HD'd herself through it LOL) and another got accepted Queensland with a sports medicine degree. So yeah, leave your options open.
