Better robots than humans?

So this is a question about your sincerity. I have been thinking a lot lately about forced sterilization and why it would be a good thing to initiate for the human race since, in Idiocracy fashion, the dumb and less natural-selection viable seem to be the ones producing the most offspring.

Now since this question implies a future where robots have replaced the positions (and hopefully natural selection vs. reproduction rates) of people of that I'm describing, what do you think of a future world in which that class of people and genes don't exist anymore since the niche will have been replaced by machines?

If the niche does not exist (and so our protection in the form of welfare for the members of a niche that doesn't exist since the niche no longer exists), how much better do you think the world will be?

Please remember to answer not the scenario per se, but the question: if all jobs which now could be replaced by a robot population instead of a now-active one that relies on valuable resources to perform a function that robots could do without, while reaching the same results, would you rather (and could you?) sacrifice the millions of people that would perish in activation of the new and more efficient technology?