That's why when Martin lists the five "key" characters he planned to "make it through all three volumes" (as in, through the end of the series), it seems like those plans might still be the case. They are -- obviously, maybe-spoilers lie ahead -- Tyrion Lannister, Arya Stark, Bran Stark, Daenerys Targaryen and Jon Snow. 

These might seem obvious, yes, but considering the way the fifth and most recent "ASoIaF" novel "A Dance With Dragons" ended, one of those five is a bit surprising. Here's hoping that those names remain true. Also, it's worth noting that he never says those are the only main characters who will live -- Sansa, for example, doesn't seem to be as major a player in Martin's original conception as she is now, and Rickon isn't even mentioned once.

http://www.zap2it.com/blogs/5_main_game_of_thrones_characters_george_rr_martin_live_to_finale-2015-02 

영감님 인터뷰 中.

임프, 말상, 불구, 용엄마, 까마귀는 

(롭, 네드, 캐틀린과는 달리) 키 캐릭터다 - 그래서 안 죽일 듯-

리틀버드랑 막내는 그리 주요한 인물은 아니다 - 아마 죽일 모양-