Any talk or even insinuation of CJH being canned is woefully premature, but I think OP is being piled on unfairly.
Schemes do evolve over time; they have to. Long-term, CJH will have to adapt to stay ahead of the curve. I had misgivings about Halzle from the time he was promoted simply because I don’t know that a Heupel disciple (heh) will be best equipped to help him do so. It would be good, in my opinion, if he had someone from a different background to bounce ideas off of. Think of how many head coaches have had to take a step back from tactics and focus more on administration, while trusting their coordinators to handle more of the Xs and Os. I’m not saying Heupel is anywhere near that point, but this idea that Halzle is completely irrelevant seems silly and naive to me.
In any event, these are medium or long-term concerns. So to answer the question in the thread title, no, not really.