Asian hospitalization rates are lower than white Americans – by 10% young, by 20% in 50-65, and by 30% for older. They should be doing something right. Maybe not just masking, but also having parents at home rather than institutions?
A guesstimate looking forward – compare with rhinovirus that apparently also has multiple strains, the most risky time is up to 24 months, getting about 10 infections. So, somewhere on the order of 10 infections + vaccination should reduce covid to a common cold. So, say half of that would be tolerable. Some, rough estimate 5 encounters would lead to normal. Vax or get sick every 9 months – 45 months, or 3.5 years. Hopefully less if each next vaccine will give not just improve generic immunity but specific to the current variant.