Downey said, rather diplomatically: "It would be kind of more appropriate for a character that already was like Black Widow (to lead a movie). It just seems like whatever Scarlett does, people want to go see it."
He added: "The funny thing is— honestly, at this point, everyone deserves a franchise. I think Jeremy Renner is — when folks see Avengers: Age of Ultron, he’s just a rockstar, a badass. And Ruffalo is pumped. He does great (work). I’d like to hear them talk even more seriously about a Hulk franchise, because that’s been one of the toughest ones to get right. But I’m sure that my parent company is feeling expansive and bold after the summer they’ve had."