The Russos said the relationship between Steve, Tony and Bucky will be explored during the new Avengers movies (at least they want to do that), so there is still hope for us. Let's hope Marvel won't ruin it for them and us with crazy/unwanted expectations for the brothers.
I think Chris is willing to play Cap for more movies, so it's totally up to Marvel wheter they kill Steve or not, want him in the films or not. I hope they keep Chris. I can't really imagine an Avengers movie (or Marvel itself) without his Steve.
But I'm quite sure he won't be able to lift Mjölnir after Civil War, at least as long as Thor is living. (If he's dead and the wielding of Mjölnir is needed to defeat Thanos, than it's possible that he lets Cap carry him for a while, but I also hope they won't kill Thor either.)
Um, I also jumped in with a little something. I'm not a native english speaker, so I just hope no mistakes left in it... http://archiveofourown.org/works/10020902/chapters/22728287



MCU Steve Rogers AppreciationThe Future for Steve Rogers in the MCUMar 25 at 5:56 AM