Sorry, but no.
Saying "I know you wanted a room near the pool, but we have none available" is a lot different than saying "you booked Art of Animation, but now you're at All Star Movies." In the former, Disney is clear at every step of the way that requests are just that -- requests. Go through a booking on the web site. Never once does it say that your choice of resort is just a request that may not be honored. Go all the way through to checkout. It's not there. Not in the big text, not in the fine print, nowhere.
When you book and pay for a room at a particular resort, you are supposed to be *guaranteed* a room at that resort. Yes, there might be the extremely exceptional circumstance -- say a resort catches fire -- where they have to ask your understanding and relocate you. But taking it as the normal idea that your choice of resort is not guaranteed? That's simply not the way it works, nor should it be.