Both Carson Palmer and Ben Rothlisberger said the same thing several years ago.
I think the NFL is close to outlawing helmet to helmet hits. It will be an automatic 15 yd penalty with suspensions and fines. The offensive players will love it and the defensive players will complain. What else is new? Almost every recent rule change has helped the offense.
Forget about drafting these hard hitting safeties sometime in the near future. They will do more harm to your own team with penalties.