Personally, I hope they stick with the comics and Steve dies. Bucky or Sam can take up the mantle of Captain America. And considering that the Russo brothers Cap 2 stuck closely to Ed Brubaker comics and Brubaker actually had a cameo appearance, it seems more than likely. Brubaker's team up of Bucky Barnes, Natasha Romanoff, Sam Wilson and Sharon Carter was an excellent read. Plus, Bucky and Nat are more morally ambiguous than Rogers was making for an interesting contrast/dynamic with Sam and Sharon.