All human coronavirus diseases, including COVID-19, are colds. Always have been. This one from 1890 might have been caused by OC43: https://en.m.wikipedia.org/wiki/1889–1890_pandemic
This is a pretty interesting hypothesis. Maybe there’s nothing really special about SARS type coronaviruses besides their novelty. Is it possible that all coronaviruses, including the ones that cause a common cold, have a similar morbidity profile to COVID? Very minor infection in the young or those with previous exposure, extremely deadly in the old and naive. Except we all catch a bunch of colds in childhood, so no…
We clearly don’t have the faintest understanding of the long-term dynamics of something like SARS, when all the conventional model parameters go to such extremes. And when the disease is evolving. And when people retreat inside and stop getting sun. And so on.