It does raise a very good question about when the parks will reopen. We will see other businesses open before we see Disney reopen. A restaurant or store can easily limit its capacity and have fewer patrons. The nature of a theme park is drawing upon crowds to be entertained in which groups of people attending shows or lining up is inevitable.
The parks can easily do away with character meet & greets, parades, fireworks, checking temps at the gate, and limiting the capacity of restaurants, stores, and shows, but how do you solve the crowds and lines? Limit park capacity too much that becomes an issue. Got to a VQ system and everyone is out on the pathways. Do you skip ever other row on Mine Train? Do you wipe down every vehicle after you play Buzz Lightyear?
Disney had a big puzzle to solve. Keep guests safe, keep their Cast Members safe, keep people employed, make money, but also make sure it doesn't turn into a PR nightmare.