you'd have to be a total idiot to agree to be a non-working spouse these days. My mom's generation it was "what you did", and we saw many of her friends end up in abject poverty after the husband traded in wifey for a younger model.
especially when the couple together decided for one of the partners to forgo a career in order for them to stay home and raise THEIR children. It's totally not fair for someone to spend the time raising the kids and not develop their career to only be dumped by their partner once the kids are raised. And then what are they supposed to do? Get a job? Well yeah, but what kind of job would they get after being out of the workforce for 20 years?