Cerci might not be dead.
I agree. If we've learned anything about GOT, it's that if a death doesn't happen onscreen, we can't rely on it. It's not an ironclad rule; Stannis was indeed killed though we never saw his actual death. The main reason for thinking Cersei really is dead is that it's hard (basically impossible with one episode to go) to see how she can still contend for the throne; her troops and allies are all dead, and it's just her and Jamie. The main reason that she may be alive, however, is that several characters -- Tyrion, Jamie, and Arya in particular -- have considerable plot rationales for doing the deed. It seems a waste of a lot of plot development to have falling masonry finish her off.
I do think Arya is now on a different track. The Hound rather forcefully presented her with a moment of decision. She walked away from the Red Keep rather than continuing on her quest for revenge. She chose life. She then was confronted by the mass suffering of innocents in King's Landing, and she appeared to be emotionally affected, which is an important evolution for the stone-cold assassin. She then tries to save others at risk to herself, which is something she hasn't done since season 1. Arya has been a PTSD casualty ever since she saw Ned being beheaded in season 1. If there is a happy ending anywhere in GOT, it might well be Arya making a solid recovery and ending as an emotionally functional human being, albeit one with remarkable assassin skills.
If Arya survives episode 8, somebody should grab a still from her final scene with the Hound and add a "Choose Life" caption. For all I know, Maisy Williams' politics are standard entertainment industry leftism, but she's a big enough girl to cope with the double entendre.