Stopped has not been proven anywhere. Maybe my conviction was a little too strongly worded, but we shall learn in a few years via serological testing regardless. My guess is that when final numbers come out we will find that about 50-70% of the global people are seropositive (meaning they have been exposed). That's about what we get for most endemic viruses. Check back in a few years and we shall see.

Let me put it this way: symptomatic cases as a percent of the population in China and South Korea are multiple orders of magnitude lower than what we saw on the cruise ship, and the growth of cases testing positive (or showing symptoms) is slowing (in absolute not just relative terms).