I don't think we know enough to assume definitively this about the wives. Maybe they aren't happy with the marriages either but they don't know how to change the marriage and have just decided to live with it. Or maybe they are happy "enough" with the marriage or maybe they get their happiness somewhere else - job, motherhood, etc.
And even if they "seem" happy, that doesn't mean that they ARE.
Of course they MAY not be happy. But maybe they are happy. Some people would say that is "fake" happiness. That they cannot possibly be Really happy if they are part of that M equation. But maybe they really are happy. And if they are, then what? Are they in denial? Should we be correcting that denial? This kind of gets to my issue with Cobra's FOO push. If a person is in denial about their issues AND they also seem to be happy campers, why on earth would they want to change?