Dunno, I can't speak with certainty that I wouldn't stay and leave, as everything depends on the situation, but switching to a less demanding job and lower pay seems as something that would benefit me in the long run. My mental health and family are worth any price difference, that is, they can't pay me that much to stay in a shitty situation.

One of the nasty things about a death march is that it drains you of the time and energy you need to search for a job that isn't a death march.