Euphoria. That's the best way to describe it. Everyone is alive. Not only that, but they're better off than they had been before. And good 'ol Dr. Constantine gets to take the credit. Good man, standing by his patients. He deserves it.
Nancy's got Jamie, and Jamie's got a Mum. With any luck they'ill make it through. Forget luck, all it takes is brains and guts, and Nancy has both of those. They'll pull through fine.
Rose finally got to see him save the day without sacrifice, and not-really-a-Captain Jack got his conscience back.
And, he remembered how to dance.