The big isseu is, that Dubai has no sustainable business model. If the tourism sector starts to sour then the real estate business is also in trouble. The big question will be are the rulers of AD willing to step in again and what will be the prize for Dubai. The trouble in China will also effect the UAE and Dubai is def. weak because their business depends on foreign money. Another threat is the political development in the neighborhood, no doubt that you'll find also fundamentalistic idiots in the UAE.
I don't see the future of Dubai that bright as a lot of other people.