Personally think anyone getting the boosters for this are mad. Its been clinically proved it can cause issues with the heart, myocarditis etc amongst other things. The risk from Covid killing anyone now is so miniscule it doesnt even warrant worrying about.
Me personally I had my 2, never had one again had Covid once that I know of and I was just a bit tired. And I have asthma and a heart condition, so youd imagine id be in the in the shit category yet no
Flu jab, clinically proven to work with minimal side effects, same with meningitis, tetanus etc etc
Wouldnt worry about not being able to get a booster, its nothing more than a money spinner for them