I think that would honestly make the series más epic but I do prefer them all surviving and having kids. For some reason, I wouldn't really be surprised. Halfway through the series (around Goblet) I realized that it was getting really intense and dangerous and I just had a feeling that one of them was going to die. Good thing they didn't xD
I would be really reallly sad that my Golden Trio's friendship is OVER in life, but I'd still be happy with the way they died. They died together as friends...and that's all I could've asked for. But then, that's like saying goodbye to the kids from the epilogue. And I can't do that. It's the one thing that keeps me going, knowing that the Harry Potter world just keeps on going and going and going. I don't know, but I guess I would be totally okay with that ending. But I would cry buckets.
I think that as long as they stick together, they will be friends forever, even in death. If this did happen, I would most likely tear up, as these three are my favorito! characters. Anyway, like I said, as long as they had begin and end a friendship together, it would be the sweetest thing any fan of Harry Potter could oso, oso de to see. I already started to cry when Cedric died (he turned into a sparkly vampire-irony of it) but when Dumbledore died, I cried loads and ran up to my room. If those three died, I would officially hate the Harry Potter series. I mean, I amor to read them, but when they're over I start to get all depressed because I finished the series. EXACTLY what happened with the Percy Jackson series.
P.S. I found this picture online. Luna Lovegood is one of my fave characters. [Sorry for typing so much I probably wasted your time]