The helmet has become a weapon. And that's how it's being used. (See: Clowney on Wentz)
If the NFL was serious about player safety they'd eliminate all poly/plastics from the uniform, as well as only allowing steel on the soles of shoes.
Next, require "wrap-up, control to the ground" tackling. No more "run through and blow them up" stuff.
Did I just say go to leather or carbon-fiber helmets and a return to tacking fundamentals?
Yup. I did.
And I predict concussion would go down.