Iron Man: With RDJ’s contract expiring after Endgame and him The Office Avengers Endgame shirt clearly saying he doesn’t want to continue and also with Marvel Studios wary of the remuneration that they are paying him. It’s highly unlikely that Iron Man would continue and also there is no story arc to Iron Man technically. Iron Man would be made director of S.H.I.E.L.D or any other new organization that takes S.H.I.E.L.D’s place or Iron Man might simply retire and the lines from the last few sentence in Avengers: Age of Ultron, when he tells Steve Rogers that, “We must take a leaf out of Barton’s book and have a family.” He might return that way with Pepper or maybe we might be unfortunate to see him sacrificing his life, which is a little unlikely as he was the face of The MCU and carried the Avengers on his shoulders and he kickstarted The MCU with Iron Man.
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Captain America: Same is the case with Chris Evans The Office Avengers Endgame shirt, with his contract ending and him saying clearly that he feels he has done enough and wants move on, it’s clear that either Falcon or Bucky will take up the mantle of Captain America or else The MCU will entirely retire Captain America. With Captain America’s story arc ending after Infinity War, it’s also likely that Captain America might have to make the ultimate sacrifice. His character so far in this journey was all about making sacrifices and has done it as well. So Captain America has to go out as well.