That's why I'm saying before calling it good, you would still need a 14 day period where the number never changes as new cases might pop up. If more people get sick (even just a mild cough) then they should get tested and if it's positive the quarantine stays in effect longer. IDEALLY they should be testing everyone in one way or the other but they won't and guess they don't have the resources, and it would only mean something if people got RETESTED regularly, otherwise who's to say they got it after getting tested from someone that didn't get tested yet. Either way this is going to be hard to isolate 100%.
Basically what I'm saying is, at some point, we need to call it and reopen stuff. It might be easier to do that on a per region basis than try to wait till it's gone EVERYWHERE. When one region has managed to get rid of the virus with near certainty then they can start to slowly ramp things back up, but still keep travel restrictions to avoid bringing it in again.
I still say, from the very beginning, all international flights should have been cancelled within a week of the virus breaking out in China. Give a chance for people to come back from their vacation, force them to quarantine, then stop all flights in and out except for cargo. That was the biggest mistake of probably all governments really.