You know, evolution doesn’t always mean things get better.
It used to be if someone couldn’t see clearly they’d die of starvation. Now we have eye-glasses, so the need to have perfect eyes isn’t required by our species anymore. It used to be if someone had no teeth they’d starve. Now we have dentists that fix teeth, so having good teeth isn’t a requirement for our species anymore.
So it could be that in the future mankind will have bad vision and bad teeth.
We might devolve, which just means the rules for survival of the fittest changes.
This image might strike a point. Please excuse the vulgarity of the message. It was not my intent to offend.