I'm reckoning that when the common cold and flu were new, they killed loads, then after adjustment in the human immune system, they killed fewer... CoVid-19 will do the same.
Kills loads... then the following year, kill fewer.
Kills loads... then the following year, kill fewer.
With COVID-19, we still don't know how it will act/morph over the next years. Might have to get a slightly different shot every year like a flu shot. You know, once shots are even in the pipeline for the common person.