I would not be so quick to write it off. With the expansion of the new theme park and the large population area, maybe this would be a good time to try one a WDL.
Disney has a lot of history in CA and I believe they would like to see the original grow. This would be different than a HH or VB because the resort & park support each other. I doubt they would build anything to big like an OKW but I am not sure if there would be any appeal hooking on to the existing hotels (been 8 years since I was there).