Why is human supremacy a necessity? Why must a child be flesh and blood? If we want our children to be smarter, more powerful, and happier than us, why should we create children as feeble as us?
I know that's a metaphor, but I feel the better metaphor is another species. These machines are likely to be different from us in significant and important ways, and they are likely to have interests we do not share, and the ability to achieve those interests with or without our consent.
Overall, I'm finding these singularity fantasies philosophically entertaining, but I'll keep saying that's sick, or disgusting.