Yes, those are valuable points as well! The situation isn't quite as bleak in Biology, but students considering graduate school really do need to have a realistic idea of what will come next. When I started graduate school, the economic climate was quite different from when I finished. I used to naively tell people it was a great idea, but now I try to make sure they sit down and think things through pragmatically. It's the difference between the "follow your dreams!" mantra and "Have a goal, but be realistic."

Many people also don't know much about the academic hierarchy when they sign on - I can't tell you how often I have to explain what a postdoctoral researcher is.