>> Once a robot can do everything an IQ 80 human can do, only better and cheaper, there will be no reason to employ IQ 80 humans. Once a robot can do everything an IQ 120 human can do, only better and cheaper, there will be no reason to employ IQ 120 humans. Once a robot can do everything an IQ 180 human can do, only better and cheaper, there will be no reason to employ humans at all, in the unlikely scenario that there are any left by that point. [1]
The answer may sound harsh, but we will not need human once AI reaches that threshold. Current IQ of AI is currently 130 as per Google.
[1] https://www.slatestarcodexabridged.com/Meditations-On-Moloch
Who is "we" ? Because if you dont need to employ a human, then who needs your services? If nobody needs anybody, what are we?
(Edit: assuming you are human)