A lot of women I have spoken with have told me they would prefer to work minimally and spend most of their time taking care of the kids and the house. I'm not going to apply their personal preferences to a made-up statistic, but these women are more compatible to men who want to provide the financial stability for their families. I can't fathom why you, exploited, think it's sexist to be disappointing if a woman originally agrees to this type of relationship and then changes her mind. That does not mean I believe she should be forced to oblige.
Just because a woman is a stay-at-home mom does not mean she lacks strength. If a man (or woman) builds his (or her) career in such a way that it becomes the source of money for the household, there's certainly a lack of independence - for both partners. This is a personal belief, but I view relying on each other as ultimately beneficial to marriage. Yin and yang.