It fails as a prediction as well. Like I said, if Lucasfilm did want to kill Leia before IX, they would’ve done it in VIII. They could’ve easily had her not float back to the ship from the vaccum of space, and the plot wouldn’t suffer. All my other critisisms are also things I don’t think they’ll do.
You couldn’t do that without changing large amounts of the story. They would have to rethink it and reshoot most of the Raddus and Crait scenes and it would have pushed the movie back a year at least.
I think they could just recut the rest using shots where she wasn’t present, but I suppose that could maybe delay the movie another six months.