4 hour work-week ain't happening.
1) Due to AI advancements, companies and business models are going to be disrupted. The last thing a firm wants is to work 4 day / week when competition can do 60 hour per week and leap frog them (including crushing them) at a crucial period.
tl ; dr -- we are entering a crunch mode for many firms (vs stability where we can think of these luxuries)
2) US is already facing labor shortage in many critical fields esp human services. A 4-day work week faces massive inflationary pressures. Again, when we enter deflation we can think of 4-day work week. A classic example would have been 2008/09 when unemployment touched 10%
3) AI will make people who work 70 hour per week even more productive. So in knowledge work roles, firms may opt to have one 70 hr extreme workaholic vs 2 32 hour people
I know sensitive topic to HNers who downvote just because they don't like the message