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They are hoping the immunity lasts 12 months. Then you would take a booster in your annual flu shot. I could live with that.

That is not necessarily true. It's possible for a vaccine to elicit a stronger or longer lasting immune response than the pathogen itself. For example by adding adjuvants

https://en.m.wikipedia.org/wiki/Immunologic_adjuvant

I don't see where in that article it says what you are describing. Only that adjuvants may improve the response to a vaccine. The response to the pathogen is not considered.

That doesn't sound right. Perhaps there could be a stream of vaccines rather than a one-off.

Also, if you can get enough people vaccinated at one time to provide herd immunity, perhaps it wouldn't be necessary to have long-term immunity, as the pandemic could be ended there and then.