Some have, it just doesn't get any press (really no reason for it to).
I completely agree that Saban has given him a long leash and Golding sure seems to have hit his ceiling. I also think if he lands elsewhere and isn't working within Saban's parameters, his defense may look quite a bit different... for better or for worse.
Don't see that happening based on the off the field stuff that is going to be asked of him and comments he's made when point blank asked about it recently. But, at one time I also didn't think Saban would bring Kiffin in and give him the offense. I could see Garrett Riley, AJ Milwee, Lebby, Weiss Jr, or Kliff Kingsbury (if fired from AZ and he wants a reset with Saban on his resume), and a wildcard hire like Phil Longo or Freddie Kitchens. It'll probably end up being none of those though....