I do Advanced Science at SYD, which means that I could major in biotechnology if I wanted to, but I dont have a particular interest in it. But I am so jealous of budding biotechnologists, because yes, it is everywhere, and you'll be able to get a job if you do well enough in uni.
If you really like it, I suggest you do it and not worry about job opportunites, because I have a feeling its going to be very big.