Oh, you see it at the youngest levels for sure. A lot of parents are not letting their kids play football anymore. But it THE sport in the US, so even if you cut the number of kids who play in half, you still have a pretty big number.
I played football in high school, but I've thought long and hard if I want my son to play. I've decided if he really wants to, he can, but I will spend as much money as possible on his helmet and any other protective equipment he needs, and really school him up on how to protect himself on a football field.