Wow. This is the first time I've read a valid, concrete detail that (at least partially) explains this massive shift in the culture.
I like to think that people were happier when we had fewer material possesions and spent more time with our families.
I work, my wife stays home with our children. Seemed to work well for thousands of years. Does my wife work? HELL YEAH she does. I tried her job for a few weeks, it's a LOT of work. I think that, in the long run, our children will be better off because of her though. No, I don't own an SUV (just the ubercool minivan..NOT!!) and a used truck. But when I go home at night I know where my kids are and what they've been expose to all day.
Perhaps it's time we quit thinking of ourselves and really did "what's best for the children".