It isn't how fast you get to college, it's the quality of your intellect (and character) at the conclusion of your formal education that determines whether you have had a good education.
And, if I may add, some things are learned along with age and life experience. You just can't skip them or learn them from someone else or from books. And you can't learn them before your body, your whole being is prepared for that. In my view, those things are important for our children. And some of them go hand in hand with formal education. For instance, comparing 2 people of different ages - one faculty student aged 20 (sustained by his family, let's say) and one aged 30 (having a family, kids, job, responsabilities). From those 2, in most cases the second one will benefit the most from the teachings and from what he's learning because he's life experience has taught him to discern what's useful for his life and what not, and he has other priorities than the first student. This situation happened to me and to my husband too. We both went to faculty while being married, or, in his case, while having also a kid and a job.
To sum it up, no matter how hard I'd try to teach my children certain things earlier, they won't be able to grasp them before the're ready for them.
Just knowing a lot and being a genius in one or more fields is one. But knowing a lot and being able to use your knowledge in real life is another - this is what we (hubby and I) want for our children.