We can get to the point of where the covid can adapt to the vaccine
This complication is called ADE. Antibody Dependent Enhancement.
As the vaccination program continues, more and more variants will occur. The reason is because the viruses, like all viruses are going to mutate (not surprising for unicellular lifeforms).
For SARS-COV-2, the part of the virus that seems to mutate the most is the spike protein.
The mRNA vaccines encode for them. Israel is now pretty pissed off about the development, because they literally did everything a supposed ideal state is supposed to do: they blocked travel, did social distancing, had people wear masks, and had a very very large vaccination program. Now look at them. They're now trying to develop a treatment based program instead. Probably because they comprehend that accepting booster shots will only make the citizens reliant on Pfizer and Moderna.
The end of the year will be interesting.