To me a movie has to be daring and provide lasting changes to the Star Trek universe. This story could have been an episode in a bottle in the grand scheme of things. If you removed it from canon what effect does it really have on the progression of Star Trek? Nothing. It's all wrapped up in nice little bow in the end and our heroes warp off to the next assignment just like every episode of the TNG series. We've never hear of the Son'a or the Bak'u and we likely never will again. There is absolutely no emotional attachment to these new species and I found myself hardly caring what happend to either by the end.