Will Continued Social Distancing Ultimately Destroy All Human Life on this Planet? A couple of things. First the current mutations are covered quite nicely by the vaccines. Secondly, the difference in hospitalization rate between those over 80 and those between 40 and 79 is about 3 to 1. So younger folks are not as "immune" as your analogies (?) imply. At the same time, the total number of those 40 to 79 is much higher (140 million vs 10 million).
Basically we are going to get to herd immunity. You get there through a combo of exposure to illness and vaccination. The higher percentage of illness, the higher the deaths. In 11 months the US has 24 million known illness exposures and in one month 12 million vaccinated. Obviously we can vaccinate way, way faster than the virus spreads with halfa55sd attempts at containing it. The US has the 12th highest death rate, so most countries are going to get to herd immunity with fewer relative deaths than the US. Sad, really.