On the other side of things, why don't we use little bits of botox to prevent wisdom teeth from growing in the first place?
If a child is not fed enough tough foods, then they end up not using and developing their facial muscles correctly.
If those muscles which should be guiding the jaw into it's correct position aren't being used correctly, they end up causing the jaw to not develop properly. Now you end up with a mouth-breathing child who has a reverse swallow, crowded teeth, and is going to need braces, a retainer, and possibly a CPAP machine.
Afaik here in Spain is rather common to have your wisdom teeth pullet out (I have), and it's the first time I hear this theory.