My mom is filing for divorce right now and my dad has been entirely financially dependent on her for the past 30 years. He was a homemaker, after all. I have been reflecting on this exact thought (specifically, women are not "loyal" and will abandon a partner that doesn't produce income or has some other shortcoming much more readily than men will). I used the "rats fleeing a sinking ship" metaphor when talking about it with my wife the other day.

That isn't to say I don't think they should be divorced. It's just what's on my mind.