Actually, I kind of thought this would be coming. The second and third movie are suppose to be very different than the first, I thought I heard that the 2nd would revolve around the oceans of Pandora. If this is true Cameron would want his land at Disney to represent all 3 of his movies and not just the first. Disney has it tough too, even if Cameron would let them build a movie based only on the first, would they want to? People may like the second and third more and wish that pandora had parts from the other movies. It would be like if you build a Star Wars land only based on the first movie and then empire and return of the Jedi comes out. Cameron could tell Disney, "this is what the 2nd and 3rd movie is about but shhh don't tell anyone" Disney could try and build it and then Cameron could end up screwing them and make the 2nd and 3rd totally different than the imagineers pictured it. Not that Cameron would do it on purpose because he doesn't want the land to suck either. But, I really don't see how you can build a land based only on the first movie, and I don't see how you can start to build a land based on all 3 until the next two movies are in production. I don't think we'll see anything start for at least 2 years.
I agree with your point. Imagine WWoHP based only on the 1st film. Flight of the Hippogriff, Hogsmeade Village, and several scenes from Forbidden Journey wouldn't even exist since they weren't a part of the first film. Although I feel the quality and depth of the imagery in the first Avatar could hold its own in a theme park, I too would want to see elements of the 2nd and 3rd film in the land as well. I don't feel Avatar is a "must-do now" for Disney anymore due to high cost, the potential for a flop, and the automatic home run in their back pocket with Carsland) DAK will have it's day, and maybe Avatar will too, but for right now I feel the main concern for TDO is DHS 2.0. They've studied how much of a success DCA 2.0 was, and although I don't think the revamp will be the 1.1 billion they spent in Cali, I think over the span of the next 5-6 years DHS is gonna look a lot different (in a good way)
I mean just think about the potential DHS lineup in 3-5 years:
RSR + full Carsland
Monster's Inc Coaster
Tangeled Show (replace BatB)
Phineas and Ferb Show (replace TLM)
Star Wars possible expansion
Indy Attraction possible update
and then add all this to the already established Tower of Terror, RnRC, Great Movie Ride, etc and you've got a much much better product than right now, along with a sure boost attendance and merchandise sales.
Avatar isn't as appealing as this lineup IMO. Also Disney cannot really afford to take a risk on a franchise like Avatar at the current moment. I was on-board with Avatar until the news/rumors of Carsland and a DHS overhaul came to be. And, coupled with the fact that the 2nd and 3rd Avatar movies aren't coming out for a while, there really isn't a rush to make a whole land based on one (however successful) film. Wait for the reception the other films get. By that time, this potential DHS plan will be completed, and the FLE will have been open for at least a few years. If they open Avatar in 2017/2018, that's fine by me at this point. And if they don't do it at all, that's also fine. There are plenty of other ideas for AK that I feel would be a better choice then Avatar. How about a Jules Verne Land close to TDS? Journey to the Center of the Earth and 20,000 Leagues under the Sea? Just a possibility but there are plenty more out there.