Our chances are better of retaining him if he feels like he can maintain that level of success here rather than he hit the lotto with a couple of great players (ie: Dylan) and needs to strike while the iron is hot to get a "better" job. Yes he is a PSU alum but who is to say that is a better fit for him (we all learned that the hard way with Frost). From all indications he and his fam love Lincoln and the university, his son is now enrolled at UNL and his wife opened her business. He said in an interview over the offseason basically that he is tired of moving his family around and would like to plant roots. If he can get the program trending in the direction we are all hoping (and expecting) where we are an annual contender for the 12 team playoff then I can foresee him sticking around and trying to build his legacy in Lincoln.
PS - I am not too worried about the NFL I think he realized he loves the college game