Unfortunately, hitting x% fully vaxxed won’t necessarily mean a return to normality, as we’re finding out in Ireland. By the time the last few % get vaccinated the protection offered to the first cohort will already be waning. Cases increase again and the emphasis switches to boosters.
On the plus side, the increase in cases with waning vaccine efficacy won’t slam hospitals as badly as it would in an un-vaccinated population. So it is possible (hopefully) to avoid the lockdowns we’re seeing in countries with very low vax rates. In the longer term we have to hope that the third booster dose gives much longer/better protection than the first two. Early data on this is encouraging (although am anxiously checking Israel’s case rates every few days!).