I'm not sure you are using Blue Ocean in the right context here. But I agree with the rest of your thought, there is no business justification for the Monorail to be expanded to Wilderness Lodge, but that has a lot more to do with CapEx business fundamentals than any specific strategy. Blue Ocean as a strategy, doesn't mean what a lot of folks here imply it to mean, in its simplest form it is just competing for business in ways that make it harder for others to compete with you, some folks refer to it as creating a 'moat' around your business. (Think the Nintendo Wii and now the Switch, Apple's App Store, Disney Magical Express)
Disney applying Blue Ocean to their current environment is leveraging its IP in the Parks. Any Theme Park can have highly themed environments and rides, but Only Disney can have Star Wars, Toy Story, Frozen and Guardians of the Galaxy, etc. (obviously YMMV on whether you think that is a good thing or not).