Well, Disney has already closed their parks in Shanghai, Hong Kong, and, most recently, Tokyo. You know it's bad when Disney closes their parks, especially as it was just at the start of their busiest season (Chinese New Year).
It's gonna be interesting to see if they eventually close here in the US. If it gets bad enough that Disney closes, I imagine the other theme park companies will follow suit.
The latest news today is that there are 20 people in self-isolation in St. Louis awaiting test results. So while most of the cases have been on the west coast, it may actually be closer to us than it seems.