Between cycling variants and the limited duration of natural immunity, you’ll. Ever get there the hard way. Meaning, we need permanent mitigation. Again, there are many different types of mitigation. It’s not masks vs nothing.
Mitigation includes investing in long term surveillance and contact tracing. Includes testing for cruises and international travel. Etc etc.
I’ve constantly said it’s fine to have “targets” but I never cared about a specific number. If you could get hers immunity at 60%, then 60% would be fine. If you don’t get herd immunity until 80%, then we need 80%.
Personally, I think any adult not vaccinated shouldn’t be allowed on public transportation or in venues like Disney World. But we don’t have the resolve for rules like that.