I think this is the wrong way to look at it. It was never actually 100/0. Homemakers did (and still do) a large amount of informal and uncompensated labor that doesn't show up in the employment statistics. In essence, employees used to be paid wages that allowed them to cover their living expenses with enough left over to pay for a full-time live-in nanny/chef/housekeeper/social secretary/etc. (in the form of their spouses).

We're moving to a world where it's more acceptable for men to choose to be homemakers and more common for women to have professions other than homemakers, both of which are good. But we've also moved from a world where the typical family had one income and one adult's full-time labor to support the household to a world where the typical family has two incomes and zero adult's full-time support without an equivalent jump in standard of living that would allow them to comfortably hire out for all the previously uncompensated labor.

In other words, typical working age adults used to only have one full-time job (as either a homemaker or a member of the formal labor force). Now adults of both genders have a full-time formal job plus a part-time job maintaining the household but without the equivalent real income increase that would imply. That's the crisis.