Clark dying could have a significant resonance,
but that really... really depends on how strong/effective the script is. A fusion of elements from TDKR with TDoS could make for an interesting narrative in Dawn of Justice (imo), considering what Man of Steel had laid the groundwork for.
This is pure speculation, but if Terrio writes that the public opinion of Superman is wholly or even just partially negative in Dawn of Justice, whether that's due to the level of destruction he was a part of or if Lex Luthor is slandering the hell out of him, it presents a possible situation where the only way Clark could convince the public that he's not an enemy of the human race is through self-sacrifice. While it might be a bit heavy-handed with the Christ metaphor again, it does make a bit of sense, i.e., where the public scolds him (IF written that way) but in the end, it turns out he's the only one who can save them. Maybe it's Bruce who realizes this after he confirms what Clark's true intentions are, and as a result, motivates Clark to overcome what would seem like truly impossible odds.
That said, I see Clark's potential death in Dawn of Justice as positive for two reasons. One: it would be a poignant mark in the narrative that's an excellent catalyst for justifying why the Justice League is formed so quickly, and two: it, in effect, would make the Justice League follow up film a bit more interesting, seeing as how Clark wouldn't be present (until the third act at least) to quell any conflict with relative ease since, well... since he's
Superman; it basically gives the writers a bit more flexibility with the narrative conflict.
With rumors that Doomsday is potentially in Dawn of Justice, The Rock saying he's playing a character who has never graced the screen before who is also able to throw down with Superman, and that I've read a rumor elsewhere that it's actually Wonder Woman who spearheads the Justice League in the films, and as such, is its formal leader... it's possible Clark does die at the end of Dawn of Justice, and will have a triumphant return in the latter half of the third act in Justice League.
Again though, this is all purely speculation