AGI and humanoid-robots, ie "synthetic humans" seem technologically feasible (vs say, FTL travel or communication), but, will synths ever be economically feasible?
even if synths could perform all human jobs, will the economics make sense to replace all jobs?
...because:
as certain jobs are synth-esized, the displaced humans compete for a shrinking pool of jobs, lowering the price for performing those jobs, requiring synths to be even cheaper to take those jobs
but...
assumes pool of jobs is finite
many argue above statement is just 21st-century-luddism
in the past, new jobs have always arisen
(have they always been better for everyone?)
and... "human desires are infinite"
(...or, are they physically based and finite)
capital may just be moved elsewhere, raising the price of those things
particularly, in things that already experience "cost disease":
housing, education, healthcare
dynamics of the above are very dependent on the "primary economic structure"
ie. would be very different under "capitalism-as-structured-in-2024-Canada" vs. "...and also land-value-taxes and universal-basic-income"
given that our current economic structures already fail at justice and egality, the synth transition will likely be very painful for a lot of people
"humans need not apply"
despite what governments say, the "real economy" doesn't care about jobs and people's welfare - just meeting the needs of those with capital
likely furthering the stratification of those-with-capital (owners of land, capital, synths) vs those-without
take respite in the power of numbers (poor outnumber the rich)
most likely is gradual ad-hoc pro-social "economic patches" by governments:
higher minimum wage, 4-day-workweek (then 3... then 2... then 1...)
increased taxes on capital gains
some wealthy + liberal + un-captured-by-corporations-and-capitalists governments may rethink the social contract with LVT + UBI
synths aren't even the end-game for automation
we already have a lot of useful non-human-form physical automation (ex. washing machines) and mental automation (ex. computers) but "can do physical and mental things like a human" is a significant threshold