But, I do kind of agree with Mr. H in that I think kids may get wrapped up in the competition aspect of climbing instead of the enjoyment and freedom of the outdoors aspect.
for example, I know a lot of folks who grew up ski racing, which is awesome and they are excellent skiiers. But a lot of them missed out on the fun of free skiing and adventuring because everytime they went skiing it was to train train train.
But on the other hand, kids need structure and competition in general is probably good for them.