The writers said they killed Sun & Jin to show us that anyone can die. Bull. Kate can't die. She won't die. Neither will Sawyer or Jack. They aren't willing to kill anyone, just the characters who aren't directly involved in the main storyline anymore. And we've already seen they can kill major characters, Locke for example.
They said they killed Sayid because if he had one last moment of selflessness it would redeem his character for us. Why did they go ruin his character in the first place? What a waste.
And no one even cares about Lapidus? Poor guy.
I also have no doubt that Miles will die, killing off the only remaining Asian character and one of the last remaining minority characters. Hugo and Rose have a chance, but Rose has nothing to do with the story anymore so they might just off her too.
They went straight up Harry Potter on us with Sun & Jin. I didn't think they would. I figured Sun would die and Jin would go take care of the baby, but now it's all pointless and Sun coming back for him meant nothing.