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I wasn’t referring to that but simply the concern that immunity might be relatively short lived: given how well this spreads even a vaccine which only gave, say, 10-12 months might be worthwhile if it meant that we could have schools, transit, restaurants, bars, churches, etc. able to operate normally.

How did you come to this conclusion? I’ve been curious about it for some time but haven’t seen anything concrete which could explain this at a level I understand.

Mutation is not the only factor determining how often a vaccine would be given. If antibodies only last a year from the vaccine dose, it should still be given yearly, even if the virus has not mutated.