This isn't some theoretical scenario - we have plenty of experience with other infectious diseases. People choosing not to be vaccinated creates opportunities for the disease to spread and either infect those who can't be vaccinated (young children, immunocompromised people etc), or gives the disease opportunities to mutate and evade the vaccine in the future.
Your right to not be vaccinated does not trump public health concerns, or shouldn't.
I think people should get vaccinated, but 'think of the children' is not a strong argument since they seem to be at very low risk of becoming seriously ill or death compared to every other age category.
I was discussing in a more general context of vaccination rights/obligations, even though for the particular case of Covid19 you are right.
Note however that we still don't know exactly what long-term consequences Covid19 may have, so even with this, if we can avoid infecting young children, we should.
Your right to not be vaccinated does not trump public health concerns, or shouldn't.