Well, you wouldn't be the JT we all know if this wasn't your attitude, but I can't see how one would ever lead to another. It's not as if Disney doesn't have the financial resources to build, enhance, or refurbish all their parks. When they decide not to go forward with some park project, I assume that means they feel it's not the best use of their financial resources at that time, not that the resources aren't there.
If the cabanas prove a financial success to Disney, I don't see why anyone would expect them to take those new profits and sink them into an attraction or other idea that they could have done already. Instead, I would expect them to try to duplicate the success, either by making more cabanas elsewhere, or by finding other things that are like the canabas--high-end upcharge items that require small initial investments.