I thought this discussion started out well, but now you mock what someone tells you simply because you don't understand it.
You keep asking for absolutes. You wanted a guarantee of success before moving away from a mediocre coach. Now you want me to come up with a magic win number taken in a vacuum. There is no magic number. What if ND had a schedule that included a few vast underdogs, several out manned opponents and a couple "big game" opponents. Say ND wins the games against the out manned and underdogs but loses embarrassingly in the big games. Would that be acceptable?
Contrast that with a schedule that might include 6 or 7 top 25 teams, maybe 3 or 4 top five to ten teams. In that instance, maybe ND wins the games in which they are big favorites and splits the tougher games but is competitive in all of them, where a play here or there determines the result. That would be a better situation, even if the win loss record may be worse. There would be evidence that the team may be on the doorstep of success.
What if a program had several incidents that embarrassed the school and tarnished her image, and even brought NCAA sanctions. Would any win total in that situation be acceptable?
Asking what bowl win, what titles won, what finite win number is acceptable without knowing how the team got there is a futile exercise. Determining whether or not a program is moving in the right direction in a timely manner is really not that difficult to see. I'm sorry if you can't understand that.