I'm not suggesting that people not set goals or work towards them. I'm saying that if someone is pursuing a degree a biology but getting nothing out of the coursework, then I see little point in continuing on taking those courses beyond what the requirements are for optometry school admission.
I also disagree with the notion that a natural science degree is superior to a liberal arts degree. Obviously, many of the concepts of a natural science degree can be difficult to understand, but most "liberal arts" courses are just as rigorous, and require just as much time and research to succeed in than any biology course. In fact, I would say that for many of the humanities courses I took, it required MORE time and effort to do well than in many of the math and science courses I took.
I think many people make the mistake in thinking that people with liberal arts degrees are all busy taking "Bowling Apprecition 101" and "Advanced Fingerpainting." While there may be some of that at some schools, I think that that is the exepction and not the rule.
One of the things that students need to realize is that the journey to the goal is just as, if not more important than the goal itself. Far too often, students fixate on the "goal" and not the process of getting there. If someone is taking biology courses and getting little out of them, they should be taking other courses.