Downey confirmed the non-plans to Variety while he was promoting his new film The Judge:
There isnâ€™t one in the pipe. No, thereâ€™s no plan for a fourth â€˜Iron Man.â€™
People love to berate Hollywood for producing nothing but sequels, but then get all shocked when there won’t be a fourth Iron Man movie right away. Many of these same people bitch and moan that Marvel isn’t introducing new characters, such as a female superhero, but then want a fourth Iron Man. You can’t have it both ways. You can’t have fewer sequels, and then have Iron Man 4.
Marvel has plans to introduce new characters in Phase 3 including Doctor Strange, The Inhumans, Black Panther, and yes even Captain Marvel. By next May there will have been five movies with Iron Man in them. Lets give new characters a chance to shine. After all, Iron Man was always a C-list character in the comics prior to the movies…