A few days ago, Robert Downey Jr. confirmed everyone's fears: there is no current plan for a fourth Iron Man movie. This news shouldn't come as a surprise since Downey Jr only signed up for two more films, Civil War and Avengers 3. Beyond this deadline, Iron Man's future in the MCU is rather unclear.
Forbes sat with Civil War director Joe Russo and here's what he had say about the possibility of an Iron Man without RDJ:
"It's almost impossible to replace Robert, he's the biggest movie star in the world. One close up from Robert is worth another actor's entire performance, he's incredibly gifted and insanely talented. I think if and when he is done with the character I think you will find that Iron Man might disappear for a while. I think the only way that you could reboot that character is to give a generational gap that would allow another actor to at least have a chance to redefine that character without the enormous spectre of Robert hanging over it. There are so many characters in the Marvel universe that can pick up the ball and run without it through the next phase or two before you need to see Iron Man again, frankly."
Russo is probably right. Today, anyone who would think about Iron Man would first think about Robert Downey Jr. He appropriated Tony Stark and made the character his own. Thus, anyone who would try to step up after him would have a hard time winning people's hearts.
If Marvel were to reboot Iron Man, and it's a big if, it would certainly take some time for people to get over RDJ's Tony Stark. Meanwhile, we have at least two more movies to enjoy Tony Stark. And that's a good news.