There is no set "number." We deal with the seasonal flu every year and have vaccines and therapeutic treatments to combat it. The threat it poses is not even remotely similar to COVID. If we are unlucky enough to be hit with a virus more deadly than COVID one day, masks will be one of the least restrictive measures that are put into place. If this crisis has revealed anything, its that our country is completely unprepared to deal with a pandemic. The only good thing that can come out of this is that people should not listen to folks like you next time who demand who do nothing to prepare for and respond to this kind of threat.