The current pfizer was manufactured to deal with the original Wuhan strain. There is no point in getting a booster unless pfizer adjust the cocktail ( I am not aware of any definite plans by Pfizer to do this). However I would urge you to watch Prof Andrew Pollards (of the Oxford Vaccine group) interview in full yesterday. Not the versions on channel 4 or skynews in which they edited the key messages. Herd immunity is impossible. A new variant will inevitably emerge which will be better at transmitting. The impression was he was throwing in the towel on the vaccine. Viruses continuously mutate. The advantageous strains evolve with the best characteristics e.g tranmissibility or antibody avoidance. In my view the vaccines cannot be manufactured and administered to suit the variants fast enough. We are still in a situation where much of the third world is unvaccinated. To start giving out booster shots in that context would be unethical in my view. However there are other unethical approaches going on right now so it's entirely possible that governments may decide to give third shots of the original version. In my view we need several good treatments. Vaccines are not going to provide a solution for all of society.