I don't think you, or the majority of people who rage on this board after games, has any idea what a championship caliber coach even is.
Most of y'all out here sniffing paint, probably thinking every coach should be Nick Saban, who by the way still made decisions that fan bases would rage about, but his occasional dumb decisions were generally covered up by the fact that Alabama had the most talented roster in the country every year.
To win a championship you need the talent, good coaching and a lot of luck. Ryan Day was considered a choke artist and damn near every Ohio State fan in the country wanted him fired after their loss to Michigan last year along with every other fan base clowning him/OSU, only for him to go on and win the national title. Do you think he went to bed one night as not a championship caliber coach then randomly woke up the next as one?
Employ a coach who gives you opportunities to win titles. Heupel is doing that. Hopefully everything else falls in to line and he gets a trophy or two before he either retires or his tenure runs its course here.