Only in high end fields: tech, finance, engineering. Even then, it really just depends. I've worked at a lot of companies (I have terrible job loyalty) and I see what's good and healthy and what's not. I've only lost two jobs and both of them were places where people were expected to work 70+ hours a week. I could get let go and be fine, because I'm an in-demand engineer with lots of experience. But I'm in a very unique position; one most people are not in.