Iron Man might no longer lead the MCU, but his legacy still lives on with upcoming Marvel releases like the miniseries Ironheart and the movie Armor Wars. From the events of Iron Man to his final appearance in Avengers: Endgame, Tony Stark developed a whole militia of armored suits and AI-driven technology. While the MCU Iron Man armor has gone through many iterations, Starks gadgets have also been used widely by other heroes and villains in the Multiverse. So, its only a matter of time for the tech billionaire’s inventory to be used by a new hero filling his shoes.
https://screenrant.com/mcu-iron-man-replacement-iron-heart-theory-harley-keener/