The question isn't whether he wants to spend the rest of his career at Arkansas or GT. The question is how can he position himself for an HC or top OC job in two years. The ACC isn't going to die in the next two years.
Would it be better to start completely fresh at Arkansas, who are at the very bottom of the SEC, or stay at GT which is already 4th in the ACC largely thanks to his offense, and has a sophomore QB who is close to setting school records?
I am sure he looks at both GT and Arkansas as stepping stones, as any good coordinator would. Staying with GT seems much more low risk and likely to bear fruit for him personally in a year or two.