I think you're discounting the fact that many of the wealthy will be mostly unaffected by this - many high-paying positions have the capability to work from home, and even still, the wealthy generally have much more in savings. There are certainly going to be a lot of people struggling with unemployment, but the people that can afford a stay at the Grand Floridian as is are not going to be hurting as much. I can't see a 70% discount being needed for that. Obviously, the deluxe resorts make up a small percentage of total rooms, but there are still plenty of people that will have disposable income.
I think that crowds will certainly be lower, but Disney's not going to have to give away their product for pennies to draw people in.