I don't mean to get political here, but this is a microcosm of what I think is wrong with society. We think that enough regulation solves whatever problem we're trying to combat, whether that be head injuries in football in sports, or any other issue. The reality of this situation is this: It comes down to assumption of risk. If you become a baseball pitcher, you might tear a rotator cuff. If you touch a hot plate, you might burn yourself. If you do a job that involves spending a fair amount of time on a computer, you may get carpal tunnel. I could go on, but I think I've made my point. May Junior Seau rest in peace---but the lawsuit his family filed against the NFL is disgusting to me. Its on the same level as the woman who sued McDonalds after spilling a cup of coffee in her lap. Understand what you're getting into, and be prepared to take responsibility for your actions.
All that said, I do have one thing to say with football. Compare the way they handle concussions with the way the hockey does. Sidney Crosby suffered one a couple years back. Correct me if I'm wrong if you pay more attention to hockey than I do, but he was out most if not all of the year that happened. When you listen to somebody like Klatt (might be a bad example) talk about it, he suffered a couple of concussions while at CU and then returned from them in the same game. The one regulation that might be useful here is this: Force people who have suffered concussions to sit a certain amount of time. I don't think much else helps here.