Yes, and we shouldn't forget why workloads have been reduced before:
https://en.wikipedia.org/wiki/Eight-hour_day
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.
And that's a fight that will be prompted by high unemployment after automation replaces many jobs.
The transition will be difficult (they usually are) but the end result (more free time for everyone) sounds good to me.
The 40 hour workweek is significantly shorter than the 6 12 hour work days people used to endure.
Why not reduce the workweek again, to say, 32 hours?