Hong Kong is not at all a bad location for a Disney park considering it's a global hub. There's a reason they placed the park near the airport. HK is the most connected city in the entirety of Asia after all. It's location serves mainland China and SEA which are both giant markets. The park was always dreamt up as a single day destination, with tourists with connecting flies in HK being one of the main demographics the park was targeting. To be frank, I think Disney always wanted a park in mainland China and planned on building one eventually, but I also believe they wanted a park in one of the 4 Tigers of Asia, and HK was the most reasonably pick considering everything. HK's government was aware of Disney's plans of a wanting to build a mainland park, and wanted reassurance. Disney gave them that in the form of massive expansion plans and a promise to not build another Chinese park in the next how many years which was enough to convince HK to invest in the park. And here's the thing, I genuinely don't believe that Disney's owns plans had the resort expanding beyond a single park. Everything that was said by Eisner and the company during the development of the park simply didn't go with that.