A movie is a movie, meaning it should adhere to certain format limitations. One of which is that it should have a satisfying ending, that doesn’t mean everything should be resolved with nothing left for a sequel. It means I don’t pay money to see something in a theater with TO BE CONTINUED at an abrupt spot as if it was a TV serial.
Trilogies with random break points were bad enough(Matrix 2 and LOTR) but now I get half the movie for the price of a full ticket?!
The Hobbit has swelled to three parts, maybe more. I’m sure one or more of The Hunger Games adaptations will be multipart too.
If you need more space than a movie to properly adapt you make a miniseries or TV show.