Comment by rchaud
Boards are not some sort of unelected shadow government that exists to depose leaders if they aren't squeezing enough blood from the stone. Appointing a new CEO is time consuming and carries enormous market ramifications that could backfire on shareholders if it goes wrong, putting their own board seats at risk. Stability and peaceful transitions of power benefit everybody in this prisoner's dillema. A new CEO will be shopped around to the public years before they actually take power so there aren't any surprises when they do.
The CEO willing to do something like that would never find themselves in that position. One becomes a CEO through a process that filters those kinds of people out and builds the remaining into willing participants.