It's true, of course, but most of them do shut down at least once a year (usually for Christmas) with students still resident there, so there'll be some idea of what staff are essential. I assume more would be required to come in still, but it could have been worked out by now.
So do I, the planning at ours is to put up some more hand sanitisers and tell people to self isolate if they've been to hot spot countries. I'm sure contingency measures are being put in place behind the scenes (the popular assumption is that it's going to require a herculean effort by already fecked off staff to offer up distance learning versions of their courses), but it seems too little, too late as far as I can see.