College, in this case I think, is merely a set of classrooms and teachers that allow a child to learn the stuff they are interested in learning and ready to learn. Since that is what we all hope for for our children (the right learning opportunities), I can't imagine that it would be a bad thing if it was child-driven.
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I agree that it is key that it be child driven. Also, I would look for the child not just to be capable of handling college level work, but to have really exhausted other options. There are some early college courses at some schools that are frankly quite an overlap with high school and those tend not to be a good choice for an early entrant.
While your early entrant isn't going to be hanging around keg parties, college can be a lot more than a series of classrooms and teachers. There are lectures, concerts, academic clubs, study groups, friends, mentor relationships, etc. I'd say my son's college experience is very similar in all those ways to my traditional age experience.
