My thoughts would be that boosters would be for the most at risk (age/comorbidity) so hopefully the majority would get a booster anyway.Bigger question what happens when we hit 80% open up & then 6 months later that 80% stops getting boosters & then it slips back to say 55%. Do we go back to what’s happening now? Serious question as I’ve never heard this talked about.
The worse scenario would be opening at 80% and then having another wave of a variant more able to bypass the immune repsonse. Then we'd be back nearly to square one.