Unfortunately if the natural selection we are talking about will go according to a virus which can mutate anytime I do not think we will have a better chance of surviving this selection that you are taking about
This virus is nothing compared to what humanity went through (smallpox, plague, polio, to name but just a few)
Regardless, as the overall opinion seems to be mostly anti antifragile, could anyone come up with anything which would however remotely count as antifragile? Just to make sure that we go a little bit beyond a simple "I do not agree with this"