Well, at some point it's up to us to say 'no.' Weekends have not always been a widely accepted ritual[1]. They only became one because of collective action.
Dedicating any and all of your free time to work only becomes a norm if we let it.
Well, they did specify your _newly_ freed time. So if you work 8 hours now and AI lets you do that work in 4, then you'll just do double the work in 8 hours, not get more free time.
I don't think there's an obvious point to take collective action.
This is the premise of the comic Power Nap.
https://www.powernapcomic.com/powernap/