Vaccines don’t kill the virus, they bolster your immune system to fight it. I’ve read that these vaccines might protect you? for an estimated 6 months. Then what?
Any time your body fights off a pathogen, antibody production ceases shortly after the infection has been killed and about 90% of the B-cells that were producing the antibodies die since they are no longer needed. The other 10% remain dormant as Memory B-cells, which are ready to be reactivated to produce the specific antibody required should that pathogen ever be encountered again.
So to answer your question about what happens after ~6 months? Your body continues doing what it does with every pathogen it’s ever encountered: remains ready to kill it. Should somebody cough a bunch of SARS-CoV-2 at you a year later, your body would respond by awakening those Memory B-cells and the SARS-CoV-2 viruses would immediately be obliterated by your natural immune response. It’s highly unlikely you’d ever experience any symptoms unless you were immunocompromised.
Then what?”
I’ve been wondering if this bug is here to stay and thst as time passes many of us are going to age or otherwise deteriorate into its crosshairs.