I disagree on several points.
There are at least 7 identified coronaviruses that infect humans. Four of them cause the common cold. I think it is premature to claim that no one has immunity to COVID-19.
In Washington state, only one person under age 40 has died from COVID-19. Less than 10% of COVID-19 infections in Washington state have been documented in people under age 40. When our Governor closed schools and universities a couple weeks ago, not even one student had been diagnosed with COVID-19.
COVID-19 emerged in Washington state on 21 January - the first case in the USA. The “Positive Infection Rate” in Washington state has held steady between 6.4% and 7.5% for high risk individuals for almost three weeks. Last week, hospitalization for COVID-19 in Washington state dropped 20%.
I think it is quite possible that COVID-19 has peaked in Washington state, and it will drift down to zero in concert with seasonal influenza at some point in May.
The common cold versions are in the alphacoronavirus genus. COVID-19 and SARS-Cov are betacoronaviruses. Someone would have had to have SARS or had a vaccine against that to already be immune to this one.
Almost a third of the cases in Missouri are under age 40.
Has Inslee stated under what conditions we will be allowed to get back to normal life? No deaths or infections for a week? A month? Three months? A year? What???