There is a clear series of (perhaps related) trends happening with Disney resort hotels:
(1) New hotels (and expansions of existing hotels) are all made of more-or-less single, large, fairly generic-looking buildings. This is in contrast with the sprawling "resort"-style design epitomized by the Polynesian, Port Orleans Riverside, etc.
(2) Room refurbishments are resulting in the rooms being less themed / more generic-looking.
I am usually not a downer (I am optimistic about many things going on at Disney and the larger theme park industry), but both of these seem to be very unfortunate changes, because (like other changes we've seen) they really do seem to chip away at the uniqueness of the Disney experience.
With regard to (1): Sprawling resorts like the Poly and POR are experiences in themselves, doing exactly what Disney is "for": immersing people in other times and places, making people "feel" like they are somewhere, etc. The "generic" style buildings are also eyesores on the WDW landscape, making it look (and feel) more and more "urban" and less "resort"-like. In the long term, this can have an impact on what it feels like to visit WDW.
With regard to (2): Truly themed rooms remind guests that they're somewhere special and different from the "real world," contributing to the "Disney bubble" (a term I don't like, because I think it trivializes the concept, but that's what has caught on) and theme/aesthetic of the hotel itself.
Disney's reason for (1) seems straightforward: it's probably just cheaper, and makes the money back faster, to build more generic, single-building hotels. So, it benefits Disney in the short run, while ignoring the long-term consequences.
But Disney's decision to do (2) is really perplexing to me. Don't people visit Disney to be immersed in themed environments? Isn't that part of the selling point for staying at a Disney hotel? The only explanations that I can think of for this are that the more genetic rooms are (a) cheaper to furnish/maintain, and/or (b) come across to guests are more "upscale," thus "justifying" higher prices.
I think this is a worthwhile topic for thorough discussion, and I for one would love to hear people's opinions, predictions, and inside knowledge about these trends.