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…)
Survival of the fittest just means the most adapted to the current environment. Our current environment has medicine so we’re adapted to that. If that suddenly changes then sure it would be an issue, but so would a climate difference of even a few degrees, a slight difference in the chemical make up of air, etc.