If the US had in reality on the order of 100 cases, there could be a credible effort to get rid of all of them and reopen. You wouldn't have to lock down hardcore for as long. In Australia from what I've seen fly across Twitter, they had the luxury of periodically locking down a city when they saw a single case, to make sure it didn't escape into the population.
I agree that there could be a way for this to work in the US but it would be a long slog. South Korea seems like they could pull it off. So I'll grant you them for sure as being superior.
