Ah but your'e forgetting the pushy parent element
Everyone's encouraged to play an instrument as a kid, but being that young they can't see the benefit and therefore don't try/give up after a short while. Later on when people see the effects, such as high school, they'd love to learn but don't have the time.
If they can see the 'cool' factor, perhaps they'll be more likely to keep it on. Just a theory :>
If anything, even a slight increase can't be a bad thing.