They can't prematurely kill Dany, Arya, Cersei, Jon, Sansa, Bran, Rickon etc. Can you imagine if Jon died in the next episode instead of the last and by something completely unrelated?
I didn't say they would die prematurely, but I can see many of those characters dying before the end.
Dany's story hardly seems like one that will redeem her in the eyes of the Westerosi people, so it sure appears as though she's doomed, though not for a while or under current circumstances.
Arya is bent on cold-blooded revenge, so I'm pretty sure she's going to die.
Cersei will definitely die unless the Lannister story takes a drastic change.
Jon will live most likely.
Rickon is probably written off the show completely if he has no great role to play in the end game.
Bran will likely serve as a way for viewers to see into the future and past to explain things that are happening. I can't see him being carried around anymore.