FWIW, DQ failed in Chicago--it closed in 2003.
Yes, the WDW site is the only one open, and rumors abound that its not long for the world. Certainly most agree it hasn't been getting much in the way of TLC.
Taken separately, the resort hotel idea seems the least likely to work. A "Disney-type" hotel in the middle of Manhattan just seems out of place, and they'd have to compete with all of the other quality hotels already there.
DVC could work as well as any other company's timeshare I suppose, provided Disney competes in substance with the established companies out there, like Hilton, Marriott and Starwood/Westin. Certainly the existing DVCs do not compare well as standalone units. They have a monopolistic location that makes up for that. Disney will have to significantly upgrade what it offers if its going to sit side-by-side with those other companies in places like Hawaii and the Caribbean.
The thing with the DTD's is that the existing DTDs are essentially dressed up strip malls, especially the DLR location. They are littered with brands that are pretty common in other areas of the country. So Disney would be coming in and essentially being just another mall developer. I suppose if they are smart about it, it could make money, but is being a mall landlord really the best use of Disney's resources?
If the idea is to combine all of this, then they are essentially building minature WDW's and DLRs without the parks. They'd be banking on the parks not really being the thing that draws people to WDW and DLR. I think that logic is flawed to the core, but certainly I've been wrong before.
The idea of them building small standalone parks, as some have suggested, is truly scary. The thought of a DCA anchoring some kind of urban or suburban resort should cause any Disney fan/stockholder to shudder.
In short, I think that with better execution, they have a far better opportunity to grow their business through the existing resorts than they do going out into the "real" world.