Iron Man 2 had a lot to deal with, especially as it was one of the final Phase 1 Marvel movies released before The Avengers. As well as dealing with that, the sequel introduced a lot of characters to Tony Stark's world, most of whom we haven't seen since. The highlight was Sam Rockwell's villainous Justin Hammer, someone who popped up in a Marvel One-Shot but deserves a lot more screentime.
During a recent interview to promote Oscar favourite Three Billboards, Rockwell was asked about reprising the role of Justin Hammer somewhere down the line and he seems enthusiastic about it!
"Of course," he responded in regards to whether he has any interest in playing Hammer again. "I have some great buddies in that franchise. Jeremy Renner is a good friend of mine, and I am pals with Chris Evans and Mark Ruffalo. Robert [Downey Jr.] is always fun. Would love to get me and Clark [Gregg] back in that franchise. That would be a lot of fun." The question is, will he get chance to?
We'll have to wait and see on that front but if Robert Downey Jr.'s tenure as Iron Man is coming to an end, it may be hard to find a place for the villain unless he squares off with another Marvel superhero.