It was tongue in cheek, but if the producers/writers would want to cast the shadow of a doubt on the integrity of his plot armor in Civil War, this would be the thing they could point to. 
Never mind that he could die in the next movie and make a reappearance in a flashback or time travel story.

Never mind that he could die in the next movie and make a reappearance in a flashback or time travel story.
--Not at you, but at the media commentators that you speak of. They've been wishfully predicting the demise of the superhero movie trend for years...and years...and years...from before the MCU even got off the ground with Iron Man. As long as superhero movies put massive numbers of butts in seats, studios will keep making them. Critics who've been wanting to see them go away for over a decade won't have a say in the matter. Even a relative flop like Green Lantern put an impressive number of butts in seats compared to most other films--It's just a matter of balancing that against the spending to keep the films profitable.
