He took Chavez to 3 rounds... and that was a heck of a feat in those days. Kenny was 26-3 with 21 KOs heading into that fight on ESPN. Kenny out-boxed guys with his fast hands and feet. For his physical (thin) build, he packed a lot more punch than people would suspect.
As for the demise of football... by evidence of the long term effects of head blows... is a longshot. I just think that with the instantaneous nature of information and public reaction... a definitive medical community report could create massive issues. However... I look at it like cigarette label warnings. If the addiction is massive... it takes a lot more than definitive medical information to eliminate it.