People are alarmed and will be watchful. P Trump has said he hopes a vaccine will be available by the end of the year, and that the military will be used to administer it. I believe that would be unconstitutional, and undesireable. People should always have the choice to take a vaccine or not. After the lockdown, and the manner in which the nursing homes seem to be targeted, ho could blame people for avoiding a vaccine?
Furthermore, how do we know what is in that vaccine? There is a concern that China, if it makes a vaccine, might intentionally contaminate it. IT could also accidentally contaminate it. According to one highly placed source, vaccines commonly have many viruses including h1n1 and corona viruses.