But the tiny proportion of very rich people can never get enough and therefore what will actually happen is we'll end up with an army of robot servants making the rich people richer and more comfortable, while the rest of us fight over the scraps.

I used to have the same utopic dream, but I have started to question whether a "small number" is actually desireable. If everyone on earth is working on great things, having more people might be better. Maybe even Elons vision of people spilling out into the stars.

Everyone on Earth is contributing to the destruction of the ecosystem. "Spilling out into the stars" is impossible, there aren't enough physical resources.

But there must be a subset that isn't? A perfect sized human resource footprint to match earths carrying capacity?

And I'm not aware of any current physical limits to space colonization? I thought the main limit was energy, and the sun has a lot to give for a while.

This is impossible with baseline humans, no matter how good you make education (without slipping into much heavier indoctrination).

Why is that?

That doesn't work. You have to pay the full costs of the robot yourself. If you hire a human the production cost of the human has been borne by their parents. In fact, employees are expected to pay for their own education via college tuition.

Let’s make other robots build the robots.