People don't understand what vaccines do. Vaccines are tested and approved based upon their preventing disease, not upon their preventing infection. Of all the human vaccines, only the HPV vaccine prevents infection. For example, children get infected with the two serotypes of polio that exist, even if they are vaccinated. That the SARS-COV-2 vaccines prevent infection is a bonus that will decline over time. However, the vaccines are still great at preventing hospitalization and death. That's because the protection of the immune system goes beyond antibodies. For example, people who cannot produce antibodies and are vaccinated have similar levels of protection against hospitalization and death as people with a normal immune system. A booster shot will likely increase the antibody levels and cut down on the infection rate and the hospitalization rate. But that will only be for a few months until we once again have these SARS-COV-2 vaccines operating as every other human vaccine. A booster is a protection for those who are vaccinated and probably even more so for the idiots who are not. The only long-term answer is to get every fool vaccinated ASAP. The above paragraphs are based upon /This Week in Virology/. probably the best technical podcast in the world on viruses and vaccines.