Maybe it's over your head.
I'll simplify it. Speaking definitively about the future of a coach is a fools errand. You can say things like "I doubt Rhule will ever take us to the playoffs" and there's nothing wrong with that.
If you say, "Rhule will never take us to the playoffs" you don't know that for sure, you're just talking like you are.
Calm down buddy.
History of success = before NU. Rhule's history before NU was much better than Riley.