Well, as I've said, he made that idea up in a time where it made sense and did well for it's time. But it started to not be a feasible system every turn of the decade and by the time we've reached the 2000s, the idea simply isn't cutting it anymore. Moreso in today's time.
A lot of ideas that were made in the early 1900s through the 50s came about in a time where it made sense and did well, least for a while. But many variables since then just diminished it's use. People aren't making as much in 40 hours than they should and they aren't making ends meet in those 5 days. People are expected now to have two jobs, more hours and no time for themselves or anyone around them.