The value was based on e direction Altman was taking the company (and with him being in control). It's silly to think just replacing the CEO would somehow keep the valuation
Unless he thinks that all the LLMs and ChatGPT app store are unnecessary distractions, and others will overtake them on the bend while they are busy post-training ChatGPT to say nice things.
He who controls that, gets a lot of money and power as a consequence, duh.