It could be for show.
OTOH, it would be a risk to fire the coach.
It sends a message to any prospective coaches about the organization itself. The Bills had a head coach opt out after less than 1 year under new ownership and fire the next guy after 1 season. That doesn't look like a good situation from the outside. Of course they can always hire a Mike Pettine type coach, but is that just rearranging the deck chairs? It may be missing the players as a component to what is wrong. It's easy to keep the coaching carousel spinning, but if players are mailing it in for coach A, B, C, ... why are they going to suddenly light a fire for coach T, U, V? Frankly, it isn't going to happen.