Some people have proposed that covid could become an endemic, meaning that there are always pockets of covid brewing somewhere. Annual flu vaccines could be accompanied with annual covid vaccines. If that really happens, we need to know more about the safety of the vaccine. Instead of being an exceptional emergency, it’s just “business as usual”, so proper studies are needed.
Convincing anti-vaxxers is impossible, because that conversation doesn’t follow the rules of a debate. Instead, the resulting monologue is a symptom of mental instability, and there isn’t much you can do about it.