@SZapper - You make a good point. However, most children's books I've seen seem to be illustrated just fine. So the system must be working, at least to a point!
Anyway, this article totally made me think of a very funny (and kind of sad) incident that happened to a friend of mine awhile back. One of her friends went to school for illustration, and he was quite talented.
However, he had trouble getting enough work in the publishing industry. He decided to go to school to be a tattoo artist so he could still use his artistic skills but also get some work.
When he was partway through tattoo school, my friend let him tattoo her. He had tattooed himself, and the tattoos looked awesome. Plus she had seen his illustrations, so she though-why not?
Long story short, the tattoo turned out horrible. Since he had only ever tattooed himself before, he barely knew what he was doing when he went to tattoo my friend.
This story has a happy ending though: my friend got the tat covered up, and her friend ended up being pretty successful as a tattoo artist, once he figured out what he was doing. Oh yeah, and he's illustrated a few children's books too.