I tend to agree with you on that one.
In this case, they're running the model with no previous history for September, and the model probably doesn't account for how these new attractions have just taken off even more than the really popular attractions like Toy Story and Mine Train. So I would plan on waits a bit shorter than what we're seeing in summer, but not the hyper-optimistic numbers they're showing. (The non-Pandora attractions look about right to me - maybe a little on the optimistic side for the safari.)
If the predictions are still unrealistically short for *next* September, then there's a problem. Seeing how other new, well-received attractions in recent years have held their popularity, I suspect that even the opening of Star Wars isn't going to cause us to see 30-minute waits at noon for Flight in the next few years - just in time for the Avatar sequels to begin and raise interest all over again.