Just a random non-specialized opinion for what it is worth ....
From what I have read here and there, influenza viruses, for example, have been documented since ancient times. There are mentions of waves of illnesses that somewhat resemble the flu.
We are born with the accumulation of immunities against crap that is in the human environment, and has been since forever, because our mother's passed their immunities onto their daughters and sons. So babies are NOT born with an immunological blank structure. They build their own immunities, based on what they inherit through the umbilical cord.
For example, when you bring home a newborn, and open the refrigerator near by, there is a massive "poof" of all kinds of molds and bacteria in there. Unless there is some serious issue there, baby should not die in 5 hours from being overgrown with bacteria and mold spores.
So being that this corona virus is so new, we don't have immunities against an entire family of viruses, over long periods of time, that we do against influenza or rhinoviruses, etc.
So I am a bit skeptical about some projected "herd immunity." It is also not the chickenpox, where kids get exposed to it and they are (supposedly) immune thereafter. I think that old-timers and republicans are hoping for a chicken-pox-.like immunity so that life can go on as usual and they won't die, but I am not going to hold my breath ... as long as I am still breathing, of course.
Basically no matter who you are, life is pretty much going to suck in some way, from now on. Brace yourself.
We will cope though. Life will continue, but unless there is some sort of broad immunity that develops, or a vaccine emerges, this condition stands to maim or kill a sizeable percent of the population within the next few years.