You know what I wish they did?
Joint family taxation and a higher tax-free threshold for families with young children.
If mum wants to go back to work then that benefits her, and it benefits her more if she has a higher-paying job (i.e., usually the kind of career that would be severely disrupted by a few years out of the workforce).
If the family wants dad to be sole earner for a while while the kids are young, he benefits from sharing a larger joint tax-free threshold + the extra for having kids.
I just don't see the sense in having mums return to work to go earn minimum wage in a job they could pick up again in 5 years time with no trouble.
(My fantasy world also includes a lot more joint investment, savings and pension accounts that women would share with their husbands instead of having to beg him to fund her pension.)