I think part of the problem with this trip is that in this economy, people aren't willing to pay top dollar for an itinerary that they could recreate themselves for the most part, for much less money. Of course, doing it on your own wouldn't have the same magic as doing it with Disney, but if you wanted to see Boston and NYC, you could do it for less by staying at less expensive hotels, etc.
Personally, I would be willing to spend the extra money for some of the foreign destinations that I'm less familiar with because it's easier to let Disney worry about transportation logistics, currency and language differences, etc. but for a domestic trip that doesn't seem to offer a lot of unique experiences that I couldn't book on my own, there's no way I'd pay that kind of money.