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does it mean that we would need to get a shot for every new variant emerged?

No. There are currently 11 variants listed by the CDC, but only one of that is a variant of concern (delta)

If another variant pops up with mutations that increase how fast it spreads, or how much strain it causes on the body, it may be classified as a variant of concern as well. Those are the ones to look out for, and the ones most likely to get special attention from vaccine manufacturers.

when what's the point of making a vaccine for specific variants if you are not going to re-vaccinate already vaccinated people

Exactly. When a new variant comes out, all vaccinated people become unvaccinated all over again.

We need at least 3 shots for each variant.

Except for those unvaccinated and relying on natural immunity. Those people don't need any shots for each variant.

Even those people ought to get vaccinated. Vaccination is the best way to stop the spread of disease. We don't rely on natural immunity to fight measles, and we shouldn't do it for COVID-19.

I find it funny that people are so worried about un-vaccinated killing those who are vaccinated, by spreading a virus that they can still get and spread even with their vaccine.

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