Covid will probably never go away. Even with vaccine and shots. Just look at the flu both of which l are Sars viruses at their core. We are 100 year removed from the Spanish Flu pandemic and the advances in medicine and science have allowed us to globally react much quicker with treatments and preventative measures. As the virus continues to mutate with new variants they may become more transmissible but come with weaker symptoms until there is a new vector or host that allows the virus to become stronger again. Kinda like remember when everyone was making a big deal about swine flu. This will happen and the Vaccines will become similar to what some said above about the flu vaccine. They will try to predict what variant or strain will be most common that year. Or maybe it just continues to evolve and gets weaker and kinda of fizzles out but right now it’s not.