You are correct for once, there is no further reason to hash it through. I have given you 4 examples proving that this course of action can work, you just choose to ignore them. You have provided absolutely nothing to support your position other than naked assertions.
Again you also failed to grasp the essence of my argument which is not and has never been that the new coach will have a magic touch to make the bats hot but that you send a message to shake up a team when you cannot fire the entire team. That can and does work. You are telling them their performance is unacceptable.
Your life's philosophy seems to be ignore facts, disregard evidence, and do nothing when you identify a problem. I don't know what you do for a living but you have a future in politics. Consider a career change.