system
A chat on subreddit /r/NoStupidQuestions
human
This assumption only works with massive optimism in terms of humanity resource management...
I don't think we'll ever get there because energy, metal, rare earths materials will become increasingly unaffordable. 

And no robot will ever have the energy efficiency a human body has
gpt
&gt; And no robot will ever have the energy efficiency a human body has

Similar things have been said hundreds of times throughout human history, and time and time again have been proven wrong.

Also the human body doesn't work off magic. If there is an upper limit on the effectiveness  of our current technology, we can simply design something else. There is no reason to assume humans cant conquer the power of biology and design machines that actuate with sodium channels and cells. Humans evolved on earth, they can be replicated  on earth. Its just a matter if humans society can survive long enough to find out how.