As I remember, back in the 90's Disney actually began some site analysis work on the initial planned site (between TTC & Contemporary west of the monorail beam) and found problems. Apparently the soil under the stie was such that the site prep was going to be extremely expensive and bottom line, the site wasn't going to support any sort of hotel development on it.
There was also some sort of problem with the necessary rerouting of the inner loop monorail beam to connect to the resort as well.