The problem Disney has with Pandora, Star Wars, Toy Story, Muppets, etc (ad infinitum) is that none of those worlds are going to really give them the same kind of success that Universal has had with Potter when it comes to the complete package of selling food and merchandise. None of those environments (as immersive as they are) created the food and drink and things that people wanted to have the same way Potter did. Anyone who read the Potter books (or to a lesser extent saw the movies) wanted to try butterbeer and every flavor beans and so many other things that were described in great detail. So far the only food we've heard about from Star Wars is blue milk (which sounds revolting). Muppet pizza endorsed by a rat hardly sounds like something people will flock to. Will there be Mr Potato Head baked potatoes? Magic mushrooms in Pandora?
So far Disney's attempts to do similar things (grey stuff. Le Fou's Brew, drinks in traffic cones) have not exactly set the world on fire with sales after the initial duster wave of people who just HAD to have them.