Not of the notion Miles should be fired myself. However I will say IF we don't dance next year his seat needs to be getting warm.
That said, not sure one can say what a win/loss threshold should be. To many variables (i.e., how many kids go elsewhere since Miles is gone (part of the reason for the dumpster fire with the women's team this year), what tempo does he want to play, will Cip change the price of a beer at Conlee's if Miles is released).