This feels to me like "Who are you going to get that's better?" Rivera might not be a great coach, but he certainly seems like a good one.
My take is that he’s a solid coach and relatively well liked, but the expectation bar is higher than what’s realistic. Especially considering injuries and talent level. I agree that they might regret this one, but Tepper is cut from the Rooney cloth so maybe he’ll do well in his search?