I agree with the sentiment, however the board has fiduciary responsibilities towards the shareholders. If they make decisions that materially affect the company

I agree with the sentiment, however the board has fiduciary responsibilities towards the shareholders. If they make decisions that materially affect the company, in this case by destroying the valuation, then the shareholders can sue. It will be extremely difficult for the board to justify that having Elon and letting him do whatever he wants is more damaging for the stock than kicking him out.