I still think a major part of it is also a calculation by Disney on how long (i.e., at what capacity) it will take to start turning a profit on the parks. Obviously they are losing money with the parks being closed, but it is not clear how much they're actually losing. There's been a lot about how much revenue they're losing, but we don't know how much actual money they're losing. There are obviously overhead costs associated with all the properties right now (minimal maintenance, utilities, taxes), but they are saving a lot of money with most of the workers furloughed, so it's a much more reduced overhead. Of the often-referenced $30 million per day that they're losing in revenue, it's not clear how much of that is profit. Once they reopen, we don't know how much the operating costs go up and what kind of capacity they need to start to lose less money then they're currently losing. Also, one thing to keep in mind, even when they are less busy overall with crowds in the park, many of the restaurants are just as busy as normal (think of all the restaurants that it doesn't matter the time of year, they're full - whether it's September or Christmas week). So, obviously, a large part of this is logistics and wanting to see how things are going at Disney Springs and perhaps even at Universal. There may also be factoring in a timeframe of how quickly they can ramp capacity back up to numbers that allow them to break even on the parks being open. If they open right away, but have keep capacity reduced for much longer than they would if they wait to reopen, then there may also be financial figures that indicate to them that waiting is the better financial decision.
. There are people with June bookings still trying to have hope 
