The problem I think is that each company usually has one CEO, so automation/higher productivity cannot lead to cutting CEO jobs by 50% or sth. Unless people with AI now can be CEOs in multiple companies at once, as they do not need to spend as much time in a single company now that they have AI? Or maybe with the help of AI they can take also different executive roles at the same time, as in now with AI why should one have a separate CEO and CTO when with AI one can do both jobs at once in the same amount of time one would do only one without AI?
Automating the c-suite doesn’t save you money by cutting headcount, it saves you money by reducing salaries. Having a decently competent AI executive would put a lot of downward pressure on the insane benefits packages these folks get