I get that operational issues are never good and always want to be avoided, but is the event being too popular really a problem that would stop Disney? No, it's not. That's typically a good problem for any business. It means that so much demand is present that you could even raise your prices or expand. Disney should just jack up the prices or sell a limited number of tickets for that day, or do something to prevent the problem, but there are certainly ways to avoid encountering last year's issues again. I just cannot see them canceling something that could make so much money if done well.
Unless they have taken their numbers and determined that extra staffing overshadows their profits, which is possible, but I doubt it.
I do expect an announcement soon.