Oh I completely agree with you on many levels, not everyone wants the 45 hour a week office job with the commute to the 'burbs. But I guess my issue is that a 10 year old doesn't know what they want. And by the time they do become an adult and decide they do want that life with medical degree that they can't access uni and are lacking the skills to live that life.
I think alternative lifestyles are perfectly fine. My issue is you (a general you) are essentially deciding for your child. I'm not saying an unschooled child can never access uni. But the road is much harder.