5. Robert Downey, Jr.
Stick with me here. I understand that Downey is tiring of big action set-pieces, but I doubt he would hesitate to read for a character who is cursed with resilience. Because that's who Robert Downey, Jr. is on the surface: a man we cannot give up on. Younger folks mostly know him as Tony Stark, but there was once a time when an attractive and energetic young comedian was covertly building a resume for the ages with a stint on SNL, smaller roles in high school and college comedies, and some surprising dramatic chops in a Charlie Chaplin biopic. Downey almost bristles now at his seemingly accidental new position as elder statesman of a billion-dollar franchise. He was much more focused on his smaller movies in the last few years such as The Judge.
I say all this because Joel is an interesting character for Downey to tackle. He's the fledgling stoic action star with a devastating history and a desperate need to keep emotionally distant. That's both sides of the Downey coin. While we've seen him dive through the tense action of the Sherlock Holmes and Iron Man movies, he's also been interested in stories like Zodiac, Charlie Bartlett, and A Scanner Darkly, in which his trademark acerbic wit is applied as a veneer to cover his characters' emotional weaknesses and addictions. Admit it, his Joel would be the most interesting by far.