Perhaps a significant fraction of men were never terribly ambitious, but they maintained social acceptability through the ease by which they could earn a middle-class living as a union factory worker? Their wives seemed content to "wear the pants" by taking care of financial affairs. Of course, to outsiders, they likely allowed the man to maintain some sense of dignity by feigning subservience (my presumption of the era's cultural standards). I'm not suggesting that factory work was not physically taxing, but jobs were generally available for anyone who wanted one. My dad recalls collecting factory job offers from Firestone, Goodyear, and BF Goodrich in a single day. Some guys who couldn't read or write very well would bring someone with them to fill out the application forms.
Is it that today's men lack the ambition of those from a generation before, or has the disappearance of union manufacturing jobs and other for-the-asking means of maintaining a middle-class lifestyle take away the false floor keeping men grounded?