If they can quickly vaccinate the people who are most likely to get infected
the thing is the people theoretically most likely to be infected have likely in disproportionate numbers already been infected. I mean if it's 1/3 of the total population that has had it, and that's the estimates here from several weeks ago (cases have dropped since but not disappeared), so what is it in people most likely to be infected, maybe 50% or more? I don't actually have data but higher than the average seems a likely assumption, since the average includes those not likely to get infected.

So the people most likely to get infected NOW (not at the start of this thing) might well be those without so much exposure especially if their exposure is increasing, with their utterly virgin immune systems. Of course those most likely to get serious illness are the same as ever unless new strains alter it: the elderly, those with preexisting conditions. I mean we can pretend it's last March and noone has natural immunity yet, but not so much so. We don't have the ever elusive herd immunity but we have a LOT of people who have had the virus.