Ah, alright. You're still under the thread's premise of a Trump 2nd term. Fair enough. I should have been more specific in my first post to you, which was generic in nature.
Yeah, under Trump it becomes more dicey. Under Biden, it is doable I believe.
Here is the scenario I see in apolitical terms. And yes, it may even work under Trump - key word 'may'.
1st roll-out to health-care workers. They get a battery of vaccinations per their job, already. The hospital infrastructure to do this is already in place. Target group (20M).
2nd, first-responders. Also well positioned with an infrastructure in place. Target group (2M).
3rd, school kids. There's an infrastructure to ensure compliance (schools) and delivery (various current providers). Target group (k-12 = 50M). Add another 20M for college kids (infrastructure in place to verify insurance, can be easily modified to require a vaccination submittal). Total target group (70M).
4th, federal employees. Again, a compliance infrastructure is already in place (HR). Target group = 2M. Add state & municipal employees for another 18-20M. Total target group (20M)
That's 112M targets, where the delivery & compliance infrastructure is already in place to various degrees. To hit 15% of our total populace, we would need to vaccinate just under 50M (44%) of the groups above. Hell, healthcare-workers, first-responders, and government workers alone get us there! Throw-in a smattering of school kids, and we're at 20%.
I think this is doable, Cardinal. Very doable. Mark my words: By the end of next year we will be well on the road to recovery. A combination of vaccination(s), antivirals, and herd immunity, will get us on the right track.