[xyzzy_plugh]

I am not so sure herd immunity is a goal. The idea is indeed to avoid overrunning the healthcare system, with an expectation that we can get the majority of the population successfully through the system. It's not well-known that we'll build even short term immunity, let alone long to medium term immunity.

If new cases flatline, that's good! If we can avoid everyone getting it, that's even better! If the globe can get a handle on things, we don't need to solely consider worst-case scenarios.