Yeah I never understood this "I want to puke" phrasing when talking about awards. The Oscars are a fun thing to talk about but at the end of the day the preferences of a large group of people are never going to exactly match your own personal preferences, and that's a good thing.
Wait, do you mean you haven't listened to the third one, or any of them? Because if you haven't listened to the score for HTTYD1...boy you are in for a treat.
I think it would go well over 400 million. 400 million is nowhere near as hard nowadays as it was back then. Question is would this hypothetical movie be based on an 8th HP book. That would definitely have some impact on performance, as if the story was movie-only then pretty much all HP fans would be compelled to go to the theater.