Listening to news reports one might think that the only way that we can move from pandemic mode to some degree of post-pandemic normalcy is to have a vaccine to rid us of COVID 19. Any vaccine that is developed will not magically make COVID 19 go away. It might help a little, but a magic bullet cure is unlikely.
The sound bite, short-attention span world is not suited to explaining complex issues such as how vaccines are developed and how they work. Instead, the world sees hope when a lab developing a vaccine sends out premature press releases of success so their stock value can increase.
There are well established scientific protocols in place for vaccine development and they all require years of trials and research. Sometimes vaccine development efforts are successful and sometimes they are not. When a vaccine is developed and made available to the public it takes years for us to see the big picture of how the vaccine works.