Scarlet already inked a deal that will pay her $25 million + a box office bonus for the role back in January, looks like they are aiming for 2020 release. www.dailymail.co.uk/news/article-5284293/Scarlett-Johansson-25m-Black-Widow-film.html Been thinking about this myself I think Cap and Tony are the most logical choices if someone were to go down. Plus they both got their 3 movies and we know the avengers are gonna get reshuffled soon, so a new leader is going to have to emerge. I think as hard as it is to say Cap might be the one I would lean on getting killed, like others have mentioned Falcon and Bucky both take on the role so a replacement is already built in. Though with that said I think Iron Man going down would be more powerful of a statement. The character has been in more MCU films than anyone.