What happens when Elon Musk is no longer leading his companies?

A significant portion of the valuation of companies like Tesla and SpaceX appears to be tied to investor confidence in Musk's vision and ability to execute ambitious goals. What happens when he's no longer around? Most companies of Tesla's and SpaceX's size have demonstrated that they can remain strong businesses and attractive investments even after a CEO transition. However, I've always felt that Musk's companies are different. Their valuations seem more closely tied to the market's belief in Musk himself than is typical for companies of comparable size. If Musk were to step away or pass away, would a successor CEO command the same level of confidence from investors, customers, and employees? Would the market reassess these companies and place greater emphasis on their underlying fundamentals rather than Musk's vision and influence? How much of their current valuation is driven by the businesses themselves versus the market's faith in Musk?