Re: Who dies?
You kill off a major character to make millions, and then you bring them back to life in order to make millions more.
The Hulk's death could involve exile into space or another dimension, and then you would have him fight his way back to Earth. Millions made.
Cap's death would lead to his replacement by the Winter Soldier. New Cap leads to more millions made.
Thor's death would put him in the Asgardian afterlife. Hela would be introduced at this point. Thor would then escape from the afterlife in his next movie.