The thing to keep in mind is that the RFID is given Disney
more information for mining: much of what CleverName described is already being tracked by every major retailer you do business with, including Disney. If you've used a credit card at Disney, they have a profile on you. It's fairly trivial to match up the credit card account to a suprisingly complete demographic profile (trivial in the fortune 500 company spending $$$ to match everything up sense). Here's a fairly famous example from a few months ago:
http://www.nytimes.com/2012/02/19/magazine/shopping-habits.html?pagewanted=1&_r=1&hp
http://www.forbes.com/sites/kashmir...teen-girl-was-pregnant-before-her-father-did/
If you've seen the Lowe's commercials where they let you set up something called 'My Lowes' and access the exact products you've bought from them, down to the paint color, filter size, options? It's the same thing: Lowe's is keeping all that data and has for many years, tracking everything you've bought from them. Now, they're setting up a service where they'll share some of their data about you with you.
With just a credit card/room key, Disney can deduce your path from financial transaction to financial transaction. They've been tracking this for most of the last couple of decades. With RFID, they're adding a much more complete picture of how each guest uses the park: every attraction, restaurant, & shop you enter, to go along with the financial information that they're already tracking.
Disney's reputation as an IT customer isn't that great -- they're known for having lots of badly built, poorly maintained, mismatched systems. For all of the stories we get about cutbacks in attraction maintenance, they're track record for IT spending is (from what I hear) a lot worse. If anything, Disney is coming very late to the data mining party. A lot of the 1.5B is simply catching up to current technology, and a lot is due to the themepark business being a fairly unique business application of the technology.
The biggest foul-up about NextGen is that it became public at all: there's very little of value in it to guests. I have to disagree very strongly with Spirit -- this is going to go into every park and resort worldwide. The public facing parts: gate admission, ride reservations, customization of the experience -- all that will probably never get past Orlando.