So I think the end game is about 20% of Americans will not ever get the vaccine unless forced to. This is based on polls I've seen where 41% Reps and 4% DS do not plan on getting vaccinated. It may even take some vaccine mandates to get to that 80% because a lot people are just not proactive and are just lazy.
The President, Governors, Mayors, etc could easily mandate their workforce get the vaccine as a way of protecting the people. I know SF Mayor is waiting until one of the vaccines is fully approved before mandating it for her employees. The Military will mandate it once a vaccine is fully approved unless Biden mandates beforehand, which he isn't likely to. I have the J&J vaccine and I can easily see a scenario in which one of the other vaccines get full FDA approval and 'erbody required to get said approved vaccine regardless of vaccination status...cuz Army lol.