Quote from @WyttenbachThis is wrong for CoV-19 as you cannot protect mucosa against external virus excess by a vaccine. You can prevent the virus to spread over the blood vessel
Sorry Wyttenbach that is not what I meant.
I was not suggesting a physical barrier but that the vaccine provides a barrier to spreading in the population as the vaccinated portion increases, hopefully eventually leading to the virus becoming vastly less present, although it is likely to become present as a continuous infectious threat due to spreading throughout the world. On the other hand the Spanish flu seemed to disappear so maybe it could happen, I don't know.
From an evolutionary perspective the virus should indeed try to mutate to beat the vaccine. How likely that is with Covid-19 I do not know, but in any case severely restricting the pool of bodies with Covid-19 should mean the virus has less chance to mutate.
Except that is has now spread to other animal species so who knows?