Nothing. He is a man whose entire career and fame depends on his beliefs, ideas, and words. He has shown those to not only be worthless, but easily manipulated and used as a weapon for his ego before anything else.

To simply say "I was wrong, I'm sorry I let my fear get the best of me" and then do nothing else would show a genuine remorse for his actions and that he recognizes his failing as a prelude to actual growth. Instead he picks up a new war to start to repeat the same actions.

His current controversy shows that has he done no reflection, as his ego and desire to be the smartest guy in the room is still 100% at the control of this crusade.