If at this point Jaime, Jon and Dany don't die, I'll find the saga extremely dissapointing. Not because I dont like the characters (Jaime was my favourite since the begining because I allways saw him like a good guy in very bad situations, even before he tells Brienne the truth about Aerys and reinforced when I read just before the hand cutoff and I tied the early Bran vision with him and his norse Tyr counterpart, and the other 2 are in my top5 too since ADWD) but because if these 3 are not the "heroes" of the history at the end (that consequently are going to die because, you know, Martin is Martin) I was very wrong telling that to my friends who had not read the books at the early stages of the show XD.
I actually still think that Jaime is AA if not the 3 at once, and until WOW is published every single argument that takes out one of the 3 of the AA role is not solid enough. And despite the divergence of the show in a lot of things, the scene where the snowflake instantly melt in the Jaime's golden hand (that should be cold itself) is one of the best proofs for me outside of the books. In the other hand, if Tyrion doesn't end rulling the remnants of Westeros, an ending with the hero triad dead is not the "bittersweet end" Martin announced, but only a sad end.