It's pretty clear at this point what you're signing up for at Tesla and SpaceX. They're intentionally trying to filter for people who will dedicate much of their life to the mission of electrifying transport and becoming interplanetary. If you want to do that, there are few better options. If you don't, avoid.

As for firing, well, who knows... The story about Elon's assistant was apparently rife with misinformation, as these things often are.