He could use the money to start an asteroid mining company. Would be helpful for Mars & other colonization.Elon has a 10 year performance package, which requires him to be the CEO or executive Chairman. Now he is not Chairman anymore. Stepping down from CEO post is like zero chance. It's not that Elon personally needs this extra 80~100 billion dollars (yes, I do think in 10~15 years this package will likely worth 80 billion dollars). He does want to use the money to do important things down the road.
If you worry about some bad things happen and fundamentally impact Tesla, just keep in mind the company could be sold for a lot of money. It's not that it just run out of cash and bankrupt. Shorts created that scenario to scare away potential investors.