It's not a 'natural' evolution, but organized fight from labour.
The same with the general conditions of work: https://en.wikipedia.org/wiki/Mines_and_Collieries_Act_1842
So, in my opinion, reducing the workweek or, an alternative that I think is more practical, stop working younger it's against powerful interests and can't be done without a fight.
The transition will be difficult (they usually are) but the end result (more free time for everyone) sounds good to me.
The transition will be difficult (they usually are) but the end result (more free time for everyone) sounds good to me.