The real risk in football is not from being tackled but from using your body as a weapon. Most bad NFL injuries stem from a player running into someone at full speed, not from wrapping them up and taking them to the ground.
Go back to leather helmets and players will use proper tackling techniques again.
Many years ago I heard Joe Paterno opine that children should not play tackle football until they are 14 years-old. Even back then I agreed with him.
I played football and rugby in college. The sports taught me that blocking caused a LOT of injuries in football; it’s not just tackling.