> Without that, we risk losing all of the progress we’ve made flattening the curve.
I personally believe that the worst could be done in many places.
New York was too slow to institute controls and stopped just short of catastrophe. But, it's likely (based on extrapolation from serological data elsewhere), that 15% of people in NYC are immune and 20% will be soon. A disease with an Rt of, say, 1.8 is still scary and still requires controls and distancing, but it's a whole different ballgames from one with an Rt of 2.5. (-0.5 Rt for reduced susceptibility, -0.2 Rt for seasonal effects, say).
> There are also a growing number of experts saying that we’ll be in flux for the rest of 2020 unless we establish that survivors can’t be reinfected, which hasn’t been confirmed yet.
The case reports we have and clinical experience suggest reinfection is very rare. The bigger question is lasting immunity. Will most people be totally protected for 3 years like with a typical cold coronavirus? Or can we expect more like the 5+ years seen with SARS-CoV-1? And even if people become susceptible again, will the disease be less severe?
I also believe that in the long run, 2019-nCoV will become "just another" endemic common cold virus, and will kill small numbers of people every year just like the other endemic respiratory coronaviruses (229E, OC43 etc) do. I bet those would be pretty fearsome introduced into an immunologically naive population. Which really sucks-- say, 10% more severe respiratory illness forever is not good. But I think it's the path we're on unless we get a truly terrific vaccine, and I don't think we can bet on that.