Re: Early box-office predictions
If we apply Iron Man 3's growth pattern to Thor, the film would see about $232 M domestic, and $682 M foreign (based on a $400 M domestic/ 800 Foreign projection for IM 3). Cap would see $225 M /$485 M based on these same patterns.
While there is always the Downey argument, Thor has two popular characters from Avengers, and Captain America has half the cast. I'm sure that will help both properties out.
MCU Rest of Decade prediction:
2015: Avengers: Age of Ultron, Ant-Man
2016: Captain America 3, Doctor Strange
2017: Thor 3, Guardians of the Galaxy 2, Inhumans
2018: Avengers 3, Black Panther, Incredible Hulk 2
2019: Iron Man 4, Doctor Strange 2, Ms. Marvel