I may actually agree with Chad on hockey. Seems like I've lived through two cycles of "hockey players are bigger, faster, and stronger than NFL players and the NHL is about to explode!"
Football is probably going to decline long term from all the concussion concerns. I've talked to neurologists, neuropsychologists, neuroscientists, etc etc, been to presentations, negotiated clinical trials for sideline diagnostic tools, and basically all anyone can tell me is "not sure" and "soccer is more dangerous." Problem is those guys retire in their late 20s and have 30 years of alcohol and drug abuse ahead of them. Football or no football some of us are going to have early onset neurodegeneration.