If states in the US do try to lock down their borders, I might drive across a few just to reinforce the fact that such measures are unconstitutional and anti-American. This is all starting to feel like mass hysteria, considering how much reports vary from country to country and the whiplash speed at which the overton window is moving. How long until Congress passes the Pandemic-triot act to suspend the 1st amendment in the same way that the Patriot act suspended the 4th and 5th?
This happens every 5 years or so; SARS, swine flu, and H1N1 were all more severe, and we didn't destroy our societies over them. We just have more access to information and mediums of emotional contagion nowadays. I understand that most people disagree with me on this, but that's what happens with mass hysteria and emotional contagion. Know that not everyone buys into it, and if you are keeping calm you are not alone :)
Personally, I'm thinking of visiting Venice in a few weeks once the planes and trains are operating again. This seems like a great opportunity to avoid the crowds and get a good deal on seeing the city before it is submerged for good.