If Carl Pelini didn't get fired for his many transgressions and Tim Miles is still working here with his, then Williams won't be fired. I can see him with a leash as short as a choke chain, but he won't be fired.
Carl and Miles, however, didn't get arrested for anything. They have plausible deniability (however hollow it may be) with the general, uninformed public. Coach Williams doesn't have that luxury.