There is no chance the number of cases stops at 3,000. If someone makes that bet, take it. I expect over 4,000 by tomorrow, let alone by next week.
The spread of the virus is alarming: 1400... 2000... 3000. That's +50% per day, and it's kept up that pace for awhile. Even more disturbing, it has a 1 to 14 day incubation period, where someone without symptoms can spread the virus. The measures you see on TV, checking temperature, are a good start - but can't contain a virus that is contagious 2 weeks before someone gets a fever.
I would expect airlines and hotels to be most impacted by the virus. Maybe you want to avoid them, or use "shorting" to bet on them dropping.
If you take 3,000 cases now and extrapolate +50% over the next few days: 4,500.. 6700.. 10,000.
It couldpass 10,000 cases by the end of the week, which I'm guessing will cause more panic. Even though this virus is less lethal than SARS, people will probably view it the same way, and panic more than they should.