I think RCID is true genius on Walt Disney's part, and I think to be fair, it demonstrates that a private company can actually do a better job at running a city than many more traditional durisdictions.
I'm certain the challenges of running WDW are very different to another similar sized parcel of land with a similar number of people, but in terms of the overall layout, road standard, building standard and transportation systems, the place functions on a higher level than many government run cities.
I know it's apples to oranges, but if Disney ran the whole world it may not be worse.