Disney does have Marvel-themed cruise days, and from videos I’ve seen, the characters stay in-character for those. Though I’m not sure what they’re trained to say if you ask about them being dead or no longer active.I'm kind of wondering how immersive Marvel Land is going to be. I'm curious what the cast members are supposed to say when a kid approaches them and asks why they're here, when in the movies they're in space or dead or something. Because Disney does have rules for what cast members are supposed to say when kids ask why they don't look like they do in the movies (they're the real person, and the character in the movie is just an actor playing them).
In Galaxy's Edge, it sounds like they only have characters from the new trilogy and the recent shows, not original trilogy characters, which at least sidesteps some of the "why are you here when you're dead?" questions you might get with some of the older characters. Will Marvel Land just leave out the very popular but no longer active in the MCU characters?
If I were making the decision, I’d fall back on the tried-and-true comic trope of alternate dimensions and timelines.
“No, see, that movie shows what could have happened in a different timeline. I’m still around to help out here.”
But I don’t know. Maybe, depending on the kid’s age, that could be a difficult concept to explain? The version you mentioned, that the movie just has actors playing these superheroes, probably works just as well for Marvel as it does other Disney properties, so maybe they stick with that?