I think it's going to go to flu vaccine protocol, that is, a new vaccine each "season" to treat the most recent variant.
So the narrative being led out might be that the unvaccinated are just petri dishes for the new variants to form, so all have to be vaccinated.
Not sure in the US if the current flu shots are billed to insurance, but I can see that coming for the covid shot.
I think the vaccine Trump bought up to give away was from HIV research. It was never introduced because HIV mutated too rapidly to make a vaccine effective, which is looking like what we have now.
So Trump made the vaccine free to the public, and showed that it was ineffective, anyway. the other option was to lockdown the country for 3 or 4 years.
Bidan now has to sell the public that a new vaccine will be effective and it has to cost something, which I don't think is going to fly with the government health structures in place and manned as they are now. Bidan is going to have to go strong man to get it through, and the public knows it's bullshit.