So we're all dead, robots take care of the infrastructure and healthcare, and there's maybe 50-100 billionaires left on the planet. Then what? They drive their sports car, do bungee jumping, sip cocktails and watch ai made movies. They don't have children? The human race dies with them? Or they have children, somehow avoid the trap of inbreeding and their children in turn have children and in no time there's again a billion of "us".
We're talking about a level of control over the remaining humans, them and their friends, that require absolute totalitarianism. Of course billionaire A won't accept to live their life according to billionaire B so it'll be a mess in no time.
This thing makes no sense to me when they can already enjoy everything the world has to offer and on top of that they're for all practical purposes above the law.