Yeah, that's all true...if they did cancel it because the story just wasn't working, then that's the better option than trying to push it through and coming out with an inferior product. The concept just sounded fun, so I was disappointed to hear that they couldn't make it work.

Yes, this. Pixar HAS been successful with their sequels thusfar (this being the Toy Story movies), but sequels are still difficult to pull off...especially if the story they first imagined was never really intended to be a longer-running story. I guess we'll just have to wait and see.