Your first statement is not provable. If AI decreases the value of the same work, it reduces GDP.

The idea that the ultra-rich are investing in AI so that they can give us three-day-weekends is also very hard to believe. People invest in AI so they can make money for themselves, not so they can give the rest of us a better life.

My guess is that if AI actually works out, there will be a lot of permanently unemployed people, and the people with jobs will be working even longer hours for fear of being fired and losing everything.