I thought about that, but, the more I consider the situation, the more I think that novel Coronavirus that causes
Significant morbidity in patients is here for quite a while. I suspect that with each passing iteration, the severity will decrease. But, the idea of herd immunity just isn't feasible.
Coronavirus has been around well before 2019. It only caused LRT infections with a few strains, that we know of. It will continue to be here for ever.
I've given up on herd immunity.