I've actually wondered about this since the start.
Before, if you got the flu at WDW (or any number of other places)... OK... You got the flu. If you died then, yeah, that sucks, but that's life.
With WDW (and, again, others) specifically keeping closed to avoid spreading COVID-19, it's like they're taking responsibility for your safety in doing this and you could argue that if you got sick that it'd be their fault because they didn't make it safe enough.
Now you can argue, "Who'd ever do that???" I wouldn't. Perhaps you wouldn't either. Still, just in their actions I could see someone inferring, "Well, they closed when it was unsafe so that means that anytime it's open that it's safe and I got sick there and they owe me medical expenses and lost work!!"
You can see this with other items where things that lasted for decades were suddenly changed to make it "more safe". The trams getting doors.. People rode the trams for decades and could all handle themselves without falling out. The trams get doors and now if a door fails, well, suddenly Disney is putting everyone at risk!
I don't know what'll come of it, if anything, but it has been a thought in my head. I'm just saying that with these types of actions you have a perceived shift in responsibility.
"Negligence" becomes a community standard definition. You have to be as cautious as the "reasonable person" or "reasonable company."
If nobody else is taking regular-flu precautions, then you can't be liable for failing to take regular-flu precautions.
On the other hand, lots of theme parks and similar activities have closed for Coronavirus. Disneyland likely won't be open for a long time.
Let me take you through how it would play out at trial...
Lawyer: "You have Disney World open, but Disney land was closed... why did you have Disney Land closed for WDW open?"
Chapek: "Well, it was a regulatory issue.. California wouldn't let us open Disneyland, but Florida let us open WDW.."
Lawyer: "California wouldn't allow Disneyland to open, because they deemed it a public health danger, correct?"
Chapek: "Well.. I don't know.. but yes, that's what California said....."
Lawyer: "And you employ lots of specialists yourself, you employ public health experts?"
Chapek: "Well... yes we do...."
Lawyer: "And, we obtained your internal documents in discovery.... your own experts told you that there was significant risk of viral spread at WDW, just like Disneyland?"
Chapek: "well yes.... but we thought the risk was reasonable..."
Lawyer: "so, though your own experts said it was an unnecessary health risk.. with many theme parks remaining closed due to those health risks, you deemed your profits to be more important?"
...................... How do you think that will play to a jury?
It means they won't open until they are pretty confident the risk is truly low.