Iron Man 4 Wishlist: 10 Things Fans Demand
8. A Legacy Character
As the Iron Man comics have introduced Riri Williams as a legacy character (much to the delight of a certain element of fans), Marvel Studios need to consider bringing in a younger character to take over the mantle as Iron Man (or a close variant). It's not like War Machine can do it any more...
Will It Happen?
Legacy characters HAVE TO happen sooner or later in the MCU, unless Marvel go out of their way to recast all of the Phase One veterans. Kevin Feige might have said openly that the Marvel comics universe is infinitely adaptable, but he would be incorrect to assume that future Phases don't need the vets in fans' eyes.
Also, replacing the character (and potentially keeping Stark as a Hank Pym style advisor) would be smarter than replacing Robert Downey Jr. He's too tied to the character's success, and it would be a dangerous gamble to assume anyone could step in. So a legacy character to take over his armour would be preferable.