It depends on a lot of assumptions. How many shots per day--currently at about 1 million in the US but ramping up. One shot vs. two shot vaccine mix. If/when younger children get added to the pool. What percentage of the population wants a vaccine.
A lot of people should be vaccinated by the end of the summer. But that would require accelerating things a fair bit from the current pace--which would put the 90% mark around Thanksgiving.
In the USA the Biden admin is setting up mass vax sites that currently aren't running(so i expect they will make an impact) and they're promising they can speed up by 50% more.
Also for what it's worth I assumed I was talking to an adult who wants a vax when I made my statement.
Yes, barring any major setbacks, I'm optimistic that by late summer I will be able to get a vaccine without going through major gyrations. (And, in practice, I'll try to get one earlier rather than later even if it's still a bit of a hassle.)
A lot of people should be vaccinated by the end of the summer. But that would require accelerating things a fair bit from the current pace--which would put the 90% mark around Thanksgiving.