I know that the third gate ideas are getting a bit long in the tooth, but I thought I'd throw this out there as an idea.
Most people seem to agree that NOS is one of the greatest themed environments ever created by Disney. I'd argue that this is due not only to the detail of the area, but the intimacy and sense of discovery and surprise through the meandering paths (though recent renovations are reducing this). I think the is also seen in the side streets off of Main Street (and, to a lesser extent, the Morocco pavilion at Epcot in WDW). What if Disney expanded this concept to a whole park, using cities (as opposed to countries) for guests to explore. There would obviously have to be a few wider areas for crowd control (boulevards in Paris, waterfront areas, etc.), but keep the intimate, winding feel of NOS for most of the park. I'd love to explore Paris, London, Istanbul, NYC, Tokyo, Seoul, Rio, Cape Town, Delhi, Moscow, Beijing, Hong Kong, Amsterdam, Moscow, etc. in a Disney park. Thoughts?