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The flu shot is a vaccine!As we speculated early on it is more a flu shot than a vaccine, so boosters will most likely be required annually.
From what is known to date, not a lot is clear about the long term efficacy of a jab, and it's even more complicated given that different variants appear to have markedly different outcomes for the same vaccine. Just as flu shots cater for many different viral strains of the flu, it may be possible for covid vaccine manufacturers to also incorporate multi strain effectivity. To date I have only read that "mixing and matching" vaccine types (eg inactivated with mRNA) could be a solution to increased efficacy.
A growing concern of virologists is that as lower income nations remain poorly vaccinated, they may give rise to increasingly altered variants of covid and currently available vaccines may prove only marginally effective.
In the meantime we can only hope that as more nations come closer to herd immunity the chance of worse variants propagating will diminish.