Once it becomes the norm even for a small section of the economy it will spread.
People are more productive in an absolute sense working fewer hours anyway.
It just takes a union, an ambitious company, or a state to force that 30 hour workweek to show some success with better talent attraction and retention and better corporate results to start a trend.
It is possible for everybody to get a piece of the pie.
We are already productive enough to have a shorter work week and more leisure, anyone saying no has specific incentives to not support it (either via financial gain from the capital accumulation funnel or work bound to their identity).
https://hn.algolia.com/?q=4+day+week
(we get there eventually with structural demographics, it’ll just take longer)
Eventually a new startup will replace your large inefficient employer with people working 10% of their time.
All that seems to be happening is that these productivity gains roll up as profits for the owner class.
What's the point of all that, to me?
The moat of the owner class is lower because now information is everywhere and it's less possible to hide behind trade secrets and implementation effort.
Based on what? The macroeconomics don't work out that way. IF productivity goes up, but consumption does not, that means that it's harder to enter the owner class, because fewer productive enterprises (owned by non-working people) are supplying a larger share of customer demand.
This may make a difference on the margins for people in the software bubble. But for the other 8 billion people on the planet, they aren't all going to become owners in your brave new world, unless consumer demand goes to the moon to soak up all that productivity. It's not doing that. Prices aren't dropping. Quality isn't increasing.
If you think I'm wrong - is there a cross-economy explosion of small one-person businesses that I'm somehow not seeing? Are gigacorps across the board all losing market share? Because on the macro scale I see nothing but further consolidation.
Based on the far lower bar to get a product out the door.
1. Consumption goes up. (It's not going up. 40 hours at your job buys you less shit today than it did 3 years ago.)
2. Mega-corps start losing marketshare and revenue to this avalanche of new one-to-two-person businesses. (They aren't. Their revenues are climbing, which implies that consolidation is what's happening, not diversification.)
Your theory does not match reality.