Several points:
First, children aren't the best judges of the topics they should be learning.
Second, children aren't the best judges of how to most effectively spend their time and judge their own pace, nor should they be: They're children. If I were given a choice in high school, I would have skipped all literature and English classes, played videogames all day, or something else that would be equally destructive to my future.
> Wouldn't it be the best possible outcome if children grew to love the learning process instead of learning to sit and regurgitate?
You're knocking down a straw man: Allowing children absolute freedom isn't necessarily going to lead to them love the learning process, nor is the current system completely about regurgitating facts.