Well??

Except for the fact that this argument has literally never gone anywhere because it is all inherently based on conjecture and soft science. This is not like an argument about people with Down syndrome.

Is this supposed to drive your point home? Because this says basically nothing. Quality of genes matter, not just quantity; humans share more than half of their DNA with plants, it means nothing when a single gene can make you too disabled to contribute to society.

You also effectively admitted that you are appealing to cultural biases.