One thought: do we need herd immunity at all? Wait, hold off pushing the downvote button. Why is this virus a problem? Not strictly because of deaths, although one would want to avoid unnecessary ones. It's due to the pressure on the healthcare system, because many people end up hospitalized, even though most of them recover (more on long COVID at the end of the post). The vast majority of people ending up in hospita…
If(as?) vaccination disrupts community spread, that should reduce reported cases and hospital occupancy. When those numbers are low, that will trigger relaxation of restrictions where I live (and I expect in other places as well).
I think there would still be a desire to vaccinate to herd immunity, but given the limited supply of vaccines, it would probably be best to prioritize vaccine use where there's community spread over building herd immunity in other areas.