If natural immunity cannot generate long-lasting immunity against SARS-CoV-2 or other coronavirusses like HCoV-OC43, and people can be infected and get ill over and over again in their lifetime, then it's very naive to think that any vaccine can do better. Also not non mRNA vaccines. In the end the same issues of antigenic imprinting, repetitive antigen presentation and the "immune exhaustion" effect, viral evolution by natural selection, antibody waning etc. etc. apply. Or I hope you are not suggesting a repetitive injection with an Adenovirus based DNA vaccine instead? Has the Astra Zeneca or any other vaccine provided long lasting immunity against covid? If not, stop this nonsense. It's a respiratory coronavirus dummy.