Read a story that said this bad habit goes back to his college days and they couldn't get him to stop it then either.

I suspect he might be a little more open to changing his tackling technique after this serious scare.

And, BTW, happy results and full healing of this injury aren't at all assured. He could find himself with continuing problems afterward. He relies on insane speed, recklessness and almost crazed emotion and passion to achieve his style. That might have to get toned down a bit.