Prediction: nobody gets arrested and production continues. Continued panic about the virus is driven largely by clickbait media and social media. These forces seem terrifying due to their volume and ability to cancel random individuals, but they wither in the fact of real threats to livelihoods. Sometimes, all that's needed to defeat a bully is standing up to him and saying "no".
If California arrests Musk, it'll be the starkest example yet of the state punishing ambition and success while rewarding fear and mediocrity.