"Let kids be kids" means something different for each household. In mine, that meant video games and sports, but mostly the former. Not sure what's going to come of any no-homework generation while this happens elsewhere: "Teens in Shanghai spend 14 hours a week on homework" http://qz.com/311360/students-in-these-countries-spend-the-m...
When I was in elementary school in the 90s, they used to try to scare us into working harder by telling us stories about how Japanese kids went to school half a day on Saturday. When my parents were in school it was about keeping up with the Soviets. These days, it's kids in Shanghai doing 14 hours a week of homework.
It was more of a global thing in Japan. Many workers actually did half a day on Saturday, so naturally were schools. Most of companies adopted 5 working day per week perhaps around the end of 80th.
School was a bit late on this one, when I was in Japan (1st year in middle school; 1992) was when they were start transitioning from 5.5 to 5. Although, I have only experienced having only second Saturday of a month off.
After I left Japan, in 1995, they've transitioned to 2nd and 4th Saturdays off, but It was not until 2002 schools in Japan transitioned to complete 5 day a week schedule.