The flaw with that is seen in how infections worked prior to mass vaccination. Smallpox - for example - existed for roughly 3,500 years. It killed over 500 million human beings in its last 100 years of existence alone.
About a decade into a worldwide mass vaccination program and smallpox was almost completely eliminated. Smallpox has since been wiped off the face of the Earth. The last recorded case was in 1978. After 3,500 years of circling the globe, slaughtering hundreds of millions of people, it was completely eradicated in basically the blink of an eye thanks to mass vaccination. It was never going away on its own. It just found new hosts to infect.
Exactly. Vaccines can do what Mother Nature (the innate immune system) can’t. We now have vaccine technology that is even better. We can now quickly adapt them to any mutant variant that can sneak through the protection of the present vaccine.