You're right, that's a good start for a biowarfare drill... But then why decades for something even worse? Imagine the potential for mutation given the ever growing number of corona hosts... Half of french population is projected to get infected https://www.lexpress.fr/actualite/societe/sante/pour-jean-michel-blanquer-le-coronavirus-touchera-probablement-la-moitie-des-francais_2120922.html For german pop it's between 40 and 70%... https://www.ibtimes.com/coronavirus-update-70-germany-could-get-infected-covid-19-merkel-says-2938103 In the US some say preparations at state level are for a 80% threshold https://poal.co/s/markets/154780 2 questions remain, when will we reach that threshold, and for how long will it stay that way? Because if it stays that way forever it's going to be 100% in no time, to be clear And we don't know yet how the virus is going to mutate, if it's going to bastardize itself into extinction, or the opposite, and become a better killer