But the vaccine does work, with up to 95% effectiveness. It may end up becoming a periodic jab to maintain effectiveness, and if 70% of the population is immunised then the incidence of illness in the community should reduce to manageable levels. If the flat-earth subset of populations continue to embrace stupid behaviours then we will continue to see isolated pockets of disease, but they should in theory be easily contained.
Disclaimer: no graduate degree in this or any related field.