Joe will never fire his buddy - or even his bud's son in law unless he's told he's got no choice and (unfortunately) I only see that happening if
(a) we end up with a losing record and Ross instructs him to clean offensive house (hopefully not Coyle and his crew)
(b) Kubiac isn't snapped up by that point which IMO he will be sooner than later. And yes, TX is a good landing spot from a face-saving standpoint for someone was just a long-standing HC.
In other words, there's a better chance of Michelle Ryan taking a chastity vow than Kubiac ending up calling our offensive plays as much as I'd love that to happen.