Falcon has been a pretty solid wingman (pun intended and I'm not even sorry) for Cap for some time now, and Age Of Ultron ended with him making the step-up to become a part of the new Avengers. His elevated status is going to continue to soar (OK, that one's bad) here as he forms part of Team Rogers. Sam Wilson is a likeable character, and one of the heroes who's really able to lighten the mood with a joke. That, combined with the fact he hasn't realised his full potential, makes me think he'll be OK here. On the other hand, you could argue about how much better Falcon can really get in subsequent movies, and he's more of a side character than a main one, so killing him off may not be as consequential as some of the other possibilities.