Overseas parks have not proven themselves to be money-makers. Euro Disney, then called Disneyland Paris, has not made money. Hong Kong is very new, but has not made money yet. Tokyo has been doing very well, but when Disney Seas opened it decapitated strong Tokyo Disneyland attendance.
The best Disney strategy is to focus where they have been making money, that is Orlando and secondly Anaheim. Both resorts need to keep visitors longer. The typical Orlando visitor stays only 4 nights. But people take a week off of work at a time. So Disney needs to get the number more like 5 to 6 nights to represent a week. Disneyland has a lower visitor stay at 2 to 3 nights. That needs to go to 4 to 5. Additional parks do make people plan to stay longer figuring a day per park. Disney's best plan is to go where the money is.