Honestly, I really liked this acquisition. The main reason is that it was a surprising acquisition. Acquiring something like the Star Wars franchise made perfect sense to me. Even Marvel did, if not purely from a merchandizing standpoint, and that Disney needed something that little boys could flock to aside from the little Disney princesses all over the place.
Working with James Cameron to develop an expansion at DAK to allow people to experience the flora and fauna of Pandora was so much more of a risky move and seemed more out-of-the-box to me. It's not like there is a ton of Avatar inspired merchandise out there that Disney was coveting. This is a unique move that they made and sometimes these types of ideas can generate truly unique experiences. I know some will say that Disney will fail with this and was a knee-jerk reaction or whatever, but I think that Joe Rohde, James Cameron and the imagineers and going to absolutely hit this one out of the park so to speak.
And oh yeah, have you ridden into DAK lately? There is no way - aside from some catastrophic world event - that this expansion isn't happening.