It's not clear at this point, they haven't even finished the first arc (Thanos) they started. If they keep the same core actors post-"Infinity War", ok cool. But now it's too early to say they're not gonna switch it up.
Fred.
Could have been done in Iron Man 2/3 and Civil War, they didn't go that way. It aint happening. Feige's already said they'll be recasting. Plus that mantle/character swapping stuff is far more damaging to the brand than a recast. There's a reason why Paramount aborted replacing Ethan Hunt with Jeremy Renner's character and scrapped Bourne Legacy sequels to bring Jason Bourne back. No one wants to see that off-brand shyt