This would still be unpaid time. Zigler raised the potential consequences of not supporting families adequately. Family leave isn't the only issue. Child care is perhaps an even greater concern. Employees won't be very productive if they're always worrying about their children.
Business can do a couple of things.
They can be family-friendly, with flex time, for example. I think the most important role of business is to be an advocate. Maybe in the lifetime of babies born today. Women still make up a slim minority at the very top levels of management. We hear business leaders bemoan the academic performance of students and the quality of family life.