Sure, the timing of an Avatar theme park exhibit in 2016 is unquestionably terrible... if the movie didn't have several sequels slated for the next few years. It does though, so the worst you can say about Avatar Land is it's a gamble. Which any big new theme park project would be.
The idea of the park is fine given that the attractions are decent. The big problem is merchandising and toys. I suppose that could change with the sequels, but kids gave approximately zero shits about Avatar 1.