You might say: "but you'll need money!". Why would I need money? The robots can provide my every need. And if I need money for some land or resource or something, I would have my robots work until my need was satisfied, I wouldn't continue having them work forever.
And even if robots did take all of the jobs, they would have to work for free. Because humans would have no jobs, and thus no money with which to pay them. So either mankind enjoys free services from robots that demand no compensation, or we get to keep our jobs.
So I really don't get the existential worry here. Yes, at a smaller scale some jobs might be automated, forcing people to retrain or work more menial jobs. But all of humanity being replaced? It doesn't make sense.
Another way to think about it is that if all of the jobs were replaced by AI, us leftover jobless humans would create a new economy just trying to grow food and make clothes and build houses and take care of our needs. The robot masters would just split away and have their own economy. Which is the same as them not existing.