There's no reason Marvel can't beat them to the punch. They could get a Black Widow movie out well before 2017, and not only would we all go see it, it'd keep Scarlett Johansson from making movies like Lucy. They can probably get a tax break for that kind of disaster prevention work, right?
Or somebody. I guess this is a more controversial opinion, and even I'm not totally sure it would work, but I think for the universe to keep going they need to keep things fresh, and recasting actors like they do with James Bond isn't the way to do it. The biggest weakness comic books have is narrative overload. It's nigh impossible to just jump right in -- you can't see The Avengers and walk into a comic book store asking for Black Widow #1, because even if the comic book store people are nice (I hear that's happened) you're still stuck trying to navigate a mythology that has been rebooted, retconned, and re[other word] into a totally nonsensical mishmash of narrative casserole.
It tastes way better if you read the lore.
But we can avoid that here. If we do the story bit where Steve Rogers dies, let's leave him dead. Let Falcon take up the Captain America mantle, like in the comics. Or, better yet, give us something new to replace him. You've already proven this possible: No one gave a shit about Guardians of the Galaxy a year ago, and yet it's making the box office toss its salad, with the best opening of the year for an "original property." Because this is what an "original property" is, now: a movie based on a book that takes place in the same universe as a bunch of other successful movies. That's the trick, Marvel: You can tell original stories with all the box-office safety of making a sequel. Please do that more.
Basically, Marvel, keep being smarter than us, and we promise that we'll keep puking money at you. Or you can repulsor-blast my heart apart, rendering me to a sobbing shell of a human being, just as broken and shamed as Natalie Imbruglia. Your call.
JF Sargent is all out of faith, this is how he feels. He's cold and he is shamed, lying naked on the floor. Yeah, try and make sense of that reference.