Yes, they maybe hoping to get a chunk of the Asian market, but they are definitely going to need a heavy dose of the brand loyal American market to make the Hawaii project work. Airfares to Hawaii from the continental US are skyrocketing right now. Aloha and ATA were major carriers to the Islands and they have gone under.
I wouldn't be surprised at all if nothing happened for quite some time.
Also, that location isn't a no-brainer. The developer has struggled to make the area a thriving tourist destination, and has been unable to lure a new resort operator for quite a few years now. Deals with various companies have fallen through. They are counting on Disney to help the area reach the "critical mass" needed to attract other builders/operators. But that is a significant risk for Disney. If people still don't respond, it could be a huge problem for Disney.
I think the problem is the area is not very close to the major tourist destinations on the island. It's reasonably close to Pearl Harbor, but Waikiki is quite a drive, especially on the sometimes congested highways. Hanauma Bay (a major snorkeling spot) and Diamond Head are on the other side of Waikiki. It's a lot more convenient for most people to just stay in Waikiki where they can literally fall out of bed onto the beach and can easily walk to dozens of restaurants and shopping areas.
Sure, the Ko'olina resort area offers a more quiet place to visit, but that's what most people already get from Maui, Kauai and the Big Island, and to a greater degree.
I also happen to think Disney is going to struggle when they go up against other highend operators in places that are nowhere near Disney parks. As rinkwide alluded, Disney's
DVC's rely extensively on their proximity to the parks. The accomodations themselves, and frankly the level of service, do not match up to what the other highend operators do in Hawaii. Disney has a tendency to overestimate the power of their brand sometimes when they venture into new areas. Not always, but it's happened before with DVC. We'll have to see if they've learned their lesson.