If it's theoretical, then why announce it this early. You're setting people up for dissapointment.
EDIT: Also why do this when so many other attempts to make Disneyland a global resort destination have fallen short, any especially when you still have important pre-existing areas to grow in like
A. The unused areas of Fantasyland
B. The area behind Pixar Pier
C. Hollywoodland
D. The rapidly aging Tomorrowland