They've been saying from the beginning that vaccines only offer short term immunity and that the virus will be mutating (hence potentially making current vaccines ineffective) so that we might end up in a scenario similar to the flu.

Now, I suppose that whether large scale booster programs, vaccine passports, etc will continue will simply depend on how widespread and serious the virus remains. So no-one knows for sure.

We might end up with combined flu/covid vaccines recommended annually for the vulnerable.