Funnily, the top level probably is within his reach.

He'd only need to do a couple things:

1) Completely relinquish control of the offense to a top-flight offensive coordinator that prioritizes a physical style of play

2) Be more ambitious in recruiting 5 star talent (which might also necessitate hiring better recruiters underneath him)

The problem is, he's unlikely to ever consider either one, since recruiting RKGs (i.e. low-hanging fruit) and running his "it-was-cutting-edge-in-1995-offense" are so central to his contrived identity as a coach.

And both would likely require him to sacrifice political capital to convince the University to spend more on his assistant coaches, which seems antithetical to his survivalist mentality.