Trotz does not want to be fickle on coaches. As a coach, he grew up in PredLand where the coach and GM stay together for 15 years, win or lose. He yearns for that stability. The combo of becoming "like the other teams," going through coaches every two or three years, and admitting he made the wrong choice in his first big-boy GM decision is too much for Trotz to handle. Minus a strong push from ownership, Trotz opts for stability over results and keeps Bruno.
IF more players signal to Trotz during their one-on-one meeting that Bruno is really Bozo, AND he reflects on why the Panthers parted ways, AND STH Renewals are going in the wrong direction, MAYBE Trotz throws Bruno overboard to buy himself more time.
If Trotz defies all these data points and keeps Bruno, Trotz owns next season's results. If we suck again, and Bruno loses the room, the new Pred majority owner may clean house.