The Disney International Program is well worth doing (I'm in Orlando now), it's a lot of fun and crazy hours if you end up in Magic Kingdom. But the number of friends you make is crazy and it's really one of those once in a life time opportunities. My tip is don't book a flight home (or book a flexible ticket) I decided to extend my program and it cost a fortune to change the ticket dates. Conversely a lot people get home sick, or its not what they expected and leave early.
After working here and seeing the scale of the Disney Parks its easy to easy how the current model of Disney parks just wouldn't work in Australia. My idea has been that rather than do a DisneyLand in Australia they could do a scaled down Disney's 'Australian' Adventure style park as an alternative or even a Disney Water Park. But for the foreseeable future Disney is pretty clearly focused on Shanghai and not Australia.