The problem is that the number wouldn't stay at 2000 unless we successfully blocked the chain of infection. In China, it's estimated that (on average) every case is giving rise to 2 or 3 more cases, and each of these can in turn infect 2 or 3 more, unless this exponential growth of infections can be halted. At the beginning of last month, there was only one known case in the world. Now we know about nearly 8000, and models predict that the true figure is much higher, in the tens or possibly hundreds of thousands. The risk is that the new virus will become endemic in the human population. This has happened before. Four coronaviruses, that today usually just cause cold symptoms, are very common all over the world. It's likely that you have already been infected by one or more of them at some point. The first of them probably entered the human population centuries ago, so we've no way of knowing whether it has always caused mild infections, or whether it has evolved to become less virulent over time. If 2019-nCoV becomes truly pandemic (with sustained transmission in multiple regions), and we are really dealing with something that's as infectious as a common cold but with a 2% case fatality rate (plus >20% of cases with very serious symptoms that require hospitalisation), then that becomes an enormous public health challenge. Of course that fatality rate may well be a significant overestimate (we really can't be at all confident about it at this point, as we have little idea how many potentially mild cases are being missed), and international efforts to contain the epidemic may still succeed. We'll just have to wait and see.