Musk also owns the board, and they all know if he goes down, they're going with him. They know he's an idiot, but he's wormed his way into every facet of the company.
It's why they allowed him to buy a company that was weeks away from bankruptcy (Solar City) for a huge premium using Tesla funds despite it being very likely to bankrupt Tesla itself.
It's why they allowed him to stay in his position, despite being sanctioned by the SEC for lying about taking the company private (at $420 because lol weed number) to pump the stock.
It's why they're pushing for his absurd $58bn pay package to be retroactively instated, even though the company just had an absolutely abysmal financial quarter.
Make no mistake looking at the official org chart. The board consists of Elon Musk, E. Musk, E. R. Musk, and Musk, Elon R. Any other names are merely a formality and entirely beholden to his whims. The only way Elon leaves Tesla is either in handcuffs or on a stretcher.