Are you trying to imply doubling the available workforce is not good? Its usually a good thing. While their motivations are cynical, those leaders are doing good.
...or are you trying to imply that keeping women out of the traditional work force (by only allowing them to work unpaid in the home in domestic servitude, labor that capital does not value) increases the value of male labor through scarcity, which would be preferred?
Sorry that second question kind of reads as an attack. A shitty coworker of mine said that to me unironically and tried to play it off as a joke when I pushed back.
Being a stay at home dad is work. Raising children is necessary work that capitalism requires, because it requires laborers. We have engineered a system in which this work is uncompensated, and if you gender this work, it causes gendered oppression.
I will also point out that in America we have decided that unless you have a "job", society has decided that you pretty much don't deserve health care. Anyone who chooses a life of domestic labor in America puts themselves in a position where they are financially dependent on their spouse and their spouse's employment status. It doesn't have to be this way. We have forged these chains.
If we had more workers, it could be that we wouldn't need those workers to work as long. Earlier retirement, shorter work weeks, whatever. The issue is not the size of the work force, the issue is what is chosen to be done with it.