I don't like this question because it implies, first, that my husband doesn't do his share of work around the house (he absolutely does!), and, second, that his income is more important than my income (it absolutely is not!).
If we found that the house couldn't be kept up with our work schedules as they are, then we'd either hire help or have to cut back on our hours. We'd make a shared decision, though. Since I make more than he does, he'd likely be the one to cut back and pick up the slack at home, but we'd still be contributing to the household equally -- me by spending more time at work, and him by spending more time at home.
But it simply isn't an issue. We both work full-time. We both do our share of chores at home. My work involves taking home a lot of work (grading and lesson planning and such), and when I get bogged down, he will take care of the dishes even though it's my turn, etc. Likewise, if he's stressed out with work or he has a lot of homework or a rehearsal or something, I will do what I can to ease his burden at home.
So I suppose I don't see where this question is leading. It seems to have come from a different decade.