This is hands down the easiest of all the predictions and as much of a sure thing as there is. Sam Wilson and Steve Rogers bonded during the events of The Winter Solider, and AoU concluded with Falcon standing proudly as a member of the updated roster of Avengers. For a character who has a rather dull history and power set in the comics, Anthony Mackie brought him to life on-screen in a terrific way that no one expected and we're excited to see more. Wilson is a former military man and has a deep personal and professional respect for Rogers, spending his time seeking out The Winter Soldier who disappeared at the end of Captain America 2. There's no way he won't side with his friend and fellow soldier.