I'm not sure if it relates, but will those people who won't let their kids play football still watch the sport with the same passion you always have? I know my son likes football because I watch it (likes basketball more, because I watch it more). I'm wondering if your views on its risk will change your viewing habits. I certainly would find it counterproductive to tell my son he can never play football, but every Friday, Saturday and Sunday I'm taking him to a game or watching on television other's people's kids risking their lives.
No.
I fall into the "I won't encourage it, but I won't stop him if he wants to" camp, but in my house on Sundays, Italian food will be cooking and the NFL will be on TV. It's their bodies, it's their brain that they are potentially scrambling.
Pro wrestling went through this stuff a few years before the NFL, thanks to the Chris Benoit murder/suicide. The prevention of concussions by eliminating moves that see the participants land on their head, or hard chairshots to the head, have been a debate point. In both cases (football & wrestling), who am I to say what somebody else should do to their own body? If you want to take a chairshot to the head, be my guest. It's not my head.
Anyway, I do watch less NFL these days. Where as in the past, I would watch wall-to-wall football all Sunday from 12-10pm, now on a typical Sunday I will watch the Rams, and then
maybe channel surf the late games or have Red Zone on while I do other things around the house. I almost never watch Thursday, Sunday night, or Monday night games anymore. The NFL product itself is far less interesting than it used to be, and part of that is a bi-product of the changes made to protect players. Too much offense, too easy to score, two minute drills that never fail watering down great comebacks, too many penalties, etc. So actually, I guess you can say
I do watch less because of these issues, in a round about way.