That is not what the math says. Even if people do become immune, it takes much much longer for the disease to spread through the population at a rate that won't

That is not what the math says. Even if people do become immune, it takes much much longer for the disease to spread through the population at a rate that won't overwhelm healthcare capacity. There was some uncertainty about this until now, but a paper just came out from the team at Imperial, whose advice was informing the UK govt. https://www.imperial.ac.uk/mrc-global-infectious-disease-analysis/news--wuhan-coronavirus/ https://www.imperial.ac.uk/mrc-global-infectious-disease-ana... https://www.imperial.ac.uk/media/imperial-college/medicine/sph/ide/gida-fellowships/Imperial-College-COVID19-NPI-modelling-16-03-2020.pdf https://www.imperial.ac.uk/media/imperial-college/medicine/s... You have to keep severe social distancing in place until there's a vaccine, or there are too many people to care for. Better just hope it's a worst-case scenario when they estimate 12-18 months for a vaccine.