I think a changing of the guard is probably for the best.
However, it's tough to say just how much Brack is to blame for this. This stuff clearly went on before him, and at the very least we can say a few of the worst were removed under him. That being said, who really knows? Maybe he has a guilty conscious for not doing enough and turning a blind eye. Maybe he just feels this is the best business move and saving face.
It's a good start towards meaningful change. Or, it's a good way to make it look like things will change.