What's Up With the Ending?
The Incredibles' climax sees its titular family doing battle with the upgraded Omnidroid in the middle of city streets. It's almost like they're real superheroes now.
A Robo Beatdown
Naturally, they handily defeat the baddie. More important than this victory, however, is that the family is now united in a way they haven't been in a long time.
Here's a telling exchange between Bob and Helen:
BOB: I can't lose you again. I can't. Not again. I'm not strong enough.
HELEN: If we work together, you won't have to be.
Finally (finally), Bob realizes that he can't just abandon his family in favor of his superhero fantasies. Even more than that, however, he realizes that he's way stronger with them than he ever was alone.
Loose Ends
Day saved, right? Not quite. Syndrome, it turns out, fled the scene and kidnapped baby Jack-Jack in an attempt to turn him into his new villain sidekick. Fortunately, Jack-Jack suddenly reveals himself to have superpowers, transforming himself into a variety of volatile forms and causing Syndrome to drop him. This is a shock to the family, as they had believed that Jack-Jack was the only family member to not have powers.
And yeah, Syndrome then gets chopped to bits by an airplane rotor, but that's not the important part. The important part is that the family is now happy and united: a welcome change from their usual emo nature.
This change is most evident in the kids. Dash is now happily taking part in track meets, though he's careful to not go overboard with the super speed. Violet, on the other hand, has gained so much self-confidence that she macks on her crush like a true player.
Plus, who knows? Maybe this isn't the last time the Parr family will don their costumes. Hint hint.