Bikes arn't rocket science and changing a derailer should be a 15 min fix assuming he carries a spares in his giant support truck. Even if he can't do it himself you would think one of his support crew could. I know he broke a steering head yesterday but is no one maintaining his multiple spare bikes when he is not riding them or is everyone too busy out riding on the front taking the wind for him?
He only has his wife as support in the Winnebago and there is no one taking the wind for him.
We don't know the full extent of the damage. For all we know the hanger may be bent etc