Smart cookie, there’s an elephant in the room no one mentions. Usually a guy leaves kollel because they can’t manage anymore, on primarily the wife’s income, or because she wants to be home. Problem is, the guy isn’t going to make more without training than he was when in kollel (unless parental help continues). Women will HAVE to continue working.
And truth is, in many cases a second income is still needed, even if living modestly.
I guess the best answers are some of the great ones that have come up already, like the last two, the understanding that husbands will have to share some of the responsibilities, etc.