Apple tends to announce dates 2–3 months out from WWDC. Last year's were announced on March 14th; 2018's were announced March 13th; 2016's weren't announced unt

Apple tends to announce dates 2–3 months out from WWDC. Last year's were announced on March 14th; 2018's were announced March 13th; 2016's weren't announced until April 18th. (2017's dates were announced February 16th, but that was the first year in San Jose.) So they haven't cancelled it yet because they haven't announced it yet. They have the luxury of waiting up to another month to see how it seems things are going -- and if things go the way it seems everyone is predicting, that's absolutely what they're going to do. Personally, "WWDC moves online for 2020" seems way more likely to me than "Apple will go ahead and announce WWDC and then wait until two weeks out to see if they have to say 'sorry, everybody, see if you can get refunds for your hotel rooms and flights.'"