Nature will take care of itself in the long run. It is adopting to reality and designing vehicles (ex: virus) that is getting closer and closer to optimal level of lethality to humans and it’s own survivability. Cold/flu viruses were not lethal enough anymore, Ebola was too lethal, SARS/MERS were with little more lethality, SARS2 with little more own survivability (likely, still to be known).