Well this law does pertain to minors and therefore I think most if not all of the people responding on this thread would not be affected. I am not really for or against this. With Minors it's a tough call, as decision making isn't all that great. Of course it forces a burden on parents and so on. It can also be seen as a stepping stone and that's no bueno.
I think the law is probably more likely to cause the kids not to want to wear a helmet due to the whole rebellious nature of most kids. I know when I was a kid, half the time I just wanted to do shit simply because someone was telling me not to or vice versa.