I still think there is something wrong with the culture and have no confidence that any next manager will not suffer the solid first season, worrying second season, and third season collapse. But the excuses have simply run out for ETH now, and whatever mitigating circumstances there may be (dwindling as they are), he cannot organize the team to at least be solid. And it is not as if he is dying on a sword of his philosophy either.
If he was an all out attack manager who refused to be defensive when needed, there would be grudging admiration in that. Similarly, if he was a stubborn park the bus manager serving dogshit football but sort of grinding out results, again, fair enough. But he is neither and the team cannot play coherently in any sense. No matter the problems around him, dressing room and/or club, that is down to him.