Agree.Nobody should be factoring herd immunity until it's proven that:
1. Previously Infected people are immune
2. Said immunity will last for at least a few years.
Temperature checks can help pinpoint people who are symptomatic, but asymptomatic people can spread the ***** and people who become very ill later are asymptomatic anywhere for 2 days to two weeks (or longer for outliers). So far studies show that the severity of one's symptoms don't correlate to how infectious they are and what kind of viral load they can expel. So checking temperatures can help uncover cases and bar infectious people from entering facilities but will not do jack sh!t to stop the majority of new transmissions. The only thing that will help is massive (and regular) testing of asymptomatic people coupled with contact tracing to know where the hot spots are, and enforced waves of new lockdowns every time any small cluster arises.
Because pan***ics last around 2 years typically I see our indefinite new normal being something like turning the economy back on but with social distancing protocols in public, measures to protect the most vulnerable, and no live events or major gatherings. The infections and deaths will sadly continue but at a contained rate that will amount to a heavy trickle until this is over.
The bulk of our leisure activities, including sports, travel and entertainment are likely to take the hardest hit through all of this.
Just can't realistically see how this plays out otherwise.