The variants will outstrip the vaccine.
The way things are shaping up we'll be seeing 3/4 vaccine shots per year for Covid19 given the way it can mutate. Logistically it'as almost impossible to keep on top of, and physically - how can we ask 80 year olds to get 3/4 vaccines per year?
The only way to get on top of covid19 is to be disciplined and remain socially distanced, mask wearing, wash hands regularly and have a vigilant track and trace system that imposes a lot more control over people who contract the virus than it does now.
Vaccines will take the edge off the surges, they wont prevent them.