His ambition is too high in everything and true Entrepreneurship. He was a founder partner in paypal. Now, you know how it is growing. His next successful venture is Tesla, a hard work he took 10 years before and made it through. Next is space-x.
Once he makes Tesla to a profitable level, he will leave to space-x venture. Until then, TESLA will be volatile as usual.
All these are already stated by him. He is able to make it through with considerable success and he will keep on doing challenging work.