OK, I hope my question doesn’t get misunderstood, I can see how that could happen.
Just a product of overthinking.
Idea is that we can live fairly easily even with some diseases/disorders which could be-life threatening. Many of these are hereditary.
Since modern medicine increases our survival capabilities, the “weaker” individuals can also survive and have offsprings that could potentially inherit these weaknesses, and as this continues it could perhaps leave nearly all people suffering from such conditions further into future.
Does that sound like a realistic scenario? (Assuming we don’t destroy ourselves along with the environment first…)
Yes. Without the selection pressures to minimize disease, we observe more disease in the population over time. This reduces our fitness for any environment without the artificial benefit of modern medicine.
People don’t want to understand because it is difficult and challenges their worldview. Is this an existential risk? Yes. Can we do anything about it? Yes.