The current one's only been CEO for four years; the structural problems presumably are older. Like, they probably _should_ consider losing the CEO, but that in itself is not going to fix anything.
Dave Calhoun was a member of the Board of Directors loooooooong before he was crowned CEO. Since 2009. Dave knows where all of the bodies are buried. In fact, he was on the board, and it’s lead director, when the 346 bodies of the Lion Air and Ethiopian passengers were buried. The man has blood on his hands.
The CEO has been on the board for much longer than 4 years though. And I agree that losing the CEO isn’t going to fix things. But putting leadership there that places safety above share value will. And the CEO is part of that leadership that needs to change.