yes, and rule changes to the game wont adress the repetitive collisions during off season practice where former pro fotball player Brendan Schaub claims most of the damage is done.
However there are a couple of things to say
1) If the game rules changed you would stop training for hits you were not expecting to take and concentrate on other factors.
2) I wonder how much of this training is necessary, vs hitting a heavy bag for instance. Perhaps it is just bad practice (no pun intended)