Maybe I'm thinking about it wrong, but rather than comparing Covid19 to the flu (which some go a lifetime without ever contracting), we should be thinking of it more as we do a cold - a cold that KILLS a certain percentage of the people who get it. Like the ubiquitous cold virus, that everyone gets at least once a year, practically everyone will get this too, whether or not they know it. I have not heard an authoritative statement about whether or not surviving a mild case produces future immunity. If it does not, Covid19 will continue to be a deadly threat until an effective vaccine is developed.