I've tallied up the surviving main cast and important recurring characters so we can start discussing who will die next season (since death was pretty scarce for named characters in Season 7).
- Bronn
- Gregor Clegane (The Mountain)
- Sandor Clegane (The Hound)
- Beric Dondarrion
- Tormund Giantsbane
- Gilly
- Grey Worm
- Euron Greyjoy
- Theon Greyjoy
- Yara Greyjoy
- Cersei Lannister
- Jaime Lannister
- Tyrion Lannister
- Missandei
- Melisandre
- Jorah Mormont
- Podrick Payne
- Qyburn
- Davos Seaworth
- Jon Snow- er, Aegon Targaryen (still going to call him Jon though)
- Arya Stark
- Bran Stark
- Sansa Stark
- Daenerys Targaryen
- Samwell Tarly
- Brienne of Tarth
- Edd Tollett
- Varys
- Gendry Waters
These are characters who I believe will show up in cameo appearances, if they come back at all- Edmure Tully (with his family- I hate that we have no idea what is happening in the Twins right now), Robin Arryn, Meera Reed, & Hot Pie.
I think the show could end with 2/3 of the Greyjoys and Lannisters being wiped out (the survivors being Yara and Tyrion). Edd, Tormund, and Beric are all at the Wall... which has now been partially destroyed, so who knows who's going to survive up there. Melisandre and Varys are basically walking around with targets on their backs as well.
I want to be shocked by the deaths. I had been lightly spoiled about Robb & Catelyn dying, but I had no idea how it was going to happen. The Red Wedding was a major shock for me (at least, it was when I was reading the book before Season 3 came out), as was the Purple Wedding. Viserys, Robert, Ned, and Renly all took me by surprise. This season, I wasn't too shocked about the deaths that happened. If the show had killed Tormund or Jorah during the quest for the White Walker, then I would have been surprised. However, it was Thoros who died, and I basically reacted with a shrug of the shoulders.
Next season, give me some heartbreaking, sudden deaths. The good guys are going to be fighting the White Walkers, and we've seen how ruthless the walkers can be. Don't chicken out on this, show.