And it does so out of concern regarding long-term brain health and growing realization on the part of parents that helmets do not really protect. I mean, it anticipates modern worries and studies of former players by about 50 years, so it's quite a challenge.
On the other hand, the 60s was the time of energetic competition between the AFL and NFL, so perhaps either or both would be open to radical rule changes or at least a series of medium steps. In addition, the Green Bay Packers were famous for their power sweep which is somewhat of a side to side play.
So, how does safer football come about?