If anything Disney has a strong ability to create deeper stories than they let on in there parks. Anyone who has ever worked in a park such as DAK or DSH and/or taken a in depth tour of those park will know this
The truth is that Disney in recent times has, with the exception of DCA and fantasyland, failed to truly invest significantly in developing its parks in the US. The announcement of avatar does not seem to have progressed much further.
My opinion is that Disney has been spending it investment dollars in other aspects of its extensive business, acquiring new franchises. Namely Pixar, marvel and now star wars. Between these franchises it is clear that Disney has the ability to create some incredible attractions and themed zones/parks. Now that the marvel buyout has started being lucrative, I anticipate that in the very near future we will see some announcements on the development front, and there will be some much needed investment in these neglected parks.
If Disney is able to bring its creative force, as evident in cars land and the far east, to these franchises on the east coast the true winners will be us as the theme park going public. Having 2 competing theme park companies vying for our dollars by creating amazing content will truly be incredible.
Nonetheless, the Studios Park should go with Star Wars at minimum. Finish Avatar and the long overdue Dwarf's coaster although no one will care next year when Diagon Alley opens.