Which is why all of these companies are currently working on "v2" of the vaccine which specifically targets omicron. But since the current version of the vaccine was found the be effective anyway, that's why it's being used. I imagine by the time next year it won't be in use anymore, purely because of its lack of effectivness for whatever variant is around then.
I think that is exactly the way we are heading as pandemic becomes endemic.
A yearly shot for vulnerable people possibly rolled in with your flu shot (or at least scheduled the same way).
I go get my flu shot every year since I'm classed as vulnerable for health reasons - the exact same reasons I went and got both covid shots and the booster the second I could.