This is a crazy time, but I think WDW and Universal are doing the right thing. Aside from being altruistic in trying to help contain the spread, the negative publicity if a major outbreak was traced to one of their parks would cost a LOT more than the lost revenue from temporarily closing the parks. And by closing the parks now, they can use it as a way to demonstrate how socially responsible they are.
I'll be really surprised if SW doesn't follow suit.