By the way, nobody else has made this argument, so I might as well throw this in:
By the very merit of technology's competition with humanity, Invil's proposal is inevitable to ensure any future for humanity.
Consider the future. Technology and computers are slowly taking over positions humans once held, though currently those roles adopted are menial, and have only served to shift humans from one occupation to another.
But what about later? What about when technology begins stepping up further in other roles? Construction is pretty much low-skilled work that could be taken over by automation in the future. Accounting, legal, and other matters can be reduced to mathematical equations, making them positions technology could take over. Science is simply a testing and analyzing of unknown variables based on knowledge already known, so it may be possible to be done by computers. Hell, if we take the leap that a computer could pass the Turing test, no job is safe. Not even the arts.
Once that happens... humans are obsolete. In terms of economics, humans no longer have a function in society and, as a result, could be possibly be considered more of a liability than an asset. As humans, we need 1/3 of the day for sleep, we can't just be bought or sold, we can demand increased wages, and we always screw up little things because our brains are imperfect and subjective! And most humans would probably object to things like having their physical forms altered by their employer to adapt to work needs like a need for a third arm or a smaller overall body to fit in tight situations.
Therefore, modifying humans is a prerequisite to maintaining organic competitiveness with technological counterparts. I'm not going to claim a robot uprising as the impact otherwise. However, at the very least, human existence is reduced to no future ability to contribute to society, leaving one without purpose, and probably without any value for living in the first place (Unless you want to get into religion, in which the interaction between technology and religion causes a whole new set of problems which would probably take another thread).
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