If the whole slave simulation with humanoid robots does not work for Elon Musk and his peers, maybe we will see W40K-like servitors, where they take the people the billionaire class deems subhuman and convert them into human drones.
I'm thinking in 50 years humans will be so much less capable than bots, that using a human as a servant or a soldier or what have you instead of using a bot would be laughable. Some of us look at AI, and Neuralink, and robot tech and see a point in time and conclude they won't get any better. That's not how any of this has ever worked. They will all get better.
The future of non-elites is unknown. But hopefully either the elites will be magnanimous, or non-elites will create new occupations that will at once, be able to create wealth, and not be able to be performed by bots. Not sure what those new occupations will be? But human ingenuity is an incredible thing, especially if the system remains market capitalism based. Because that will mean your rent and food will depend on you coming up with something to do. I think people will think of something.
If not? Well, let's just say the future might not hold societies as pleasant for non-elites as the societies of today.