You are clearly wrong about "fire and forgot". It may feel to you like this because you do not recall that for most vaccines multiple shots are needed for suffi

You are clearly wrong about "fire and forgot". It may feel to you like this because you do not recall that for most vaccines multiple shots are needed for sufficient immunity and most of the viruses do not mutate away like SARS-Cov-2. Flu vaccine is that kind of type but it is far from super effective having efficiency somewhere between 10-60% (still saves lives and productive days) and we normally do not have flu pandemic and even when we do, it has never been really infectious compared to Delta or Omicron. Current vaccines appear even effective against sever case of Omicron, though not that much against mild cases. There would be no need for this forth shot if this Omicron did not appear out of the blue. Given that most of India and most likely Africa will become "vaccinated" either by Delta (SAR and India mostly already are) or Omicron then how much potential is there left for one more surprise variant?