I'm not sure myself, how this new development in human history will progress. However, since this is about AIm which Simon has declared is mostly about the recognition of patterns, I will comment that in the past most developments have eventually failed to have the feared effect, and some have actually worked out as beneficial. Maybe that is because I tend to look at things from a positive viewpoint.
Will that happen in this case? I guess it is possible, but given human behaviour (one thing that I'm negative about) it may not. For example robotics and AI can replace workers. Once 'wharfies,' the workers who once unloaded ships were many. The number of wharfies has dwindled over the past 50 years. For example in the port of Qingdao (China) about 7th in world in terms of tonnage, only 9 workers are now required as it is now automated. (See - https://news.cgtn.com/news/3d637a4e31677a4d/share_p.html )
More and more ports in China are being automated, Shanghai's Yangshan port, often the largest in the world in terms of freights throughput is also automated.
https://www.youtube.com/watch?v=IzOeAGAu60k
Currently, (as I understand the situation) most workers are absorbed in other industries, which may be true since China is said by some western commentators to have a labour shortage. But that sort of situation cannot continue. But what could happen is that working hours could be reduced gradually from the present (in most western countries) from a 5 day week to a 4 day week and even a 3 day week. Where would that process end. I've got no idea!
But here's someone who claims he's considered the possibilities. His name is Lee Kaifu and this is his TED lecture: https://www.youtube.com/watch?v=ajGgd9Ld-Wc&feature=share&fbclid=IwAR1aTiNJavaj5fnrXmkKByPS35cS2eFzYe2wF6E5pSsj2qZc4pEpLnRSMUA
I appreciate that's not an answer to your apocalyptic vision of a human catastrophe, but projecting a narrow vision into such a time-scale cannot have a realistic answer.