[MINOR “GAME OF THRONES” SPOILERS BELOW. ]
This is what makes me worry over Arya’s fate before the show ends. I think a lot of people would think of Jon as the “lone wolf” of the family, being a putative “bastard” and being relegated to the Night’s Watch, etc. I, for one, always imagined the prognostication applied to him. (I think it was a verse Ned recited to Sansa in Season 1?) But … being marginalized, vilified or betrayed doesn’t mean Jon has been alone.
Jon’s has always had friends near him. He became a King, for god’s sake. But more than any of the other Stark children, Arya has usually walked alone. Her primary motivation is personal revenge, whereas Sansa, Jon and Bran are respectively motivated by their duties to House Stark, Westeros, and all of humanity. (I myself am slightly befuddled about Bran’s importance, including during the Battle of Winterfell. He’s … “the world’s memory?” I thought we had books and maesters for that. But whatever.)
Arya doesn’t exactly leave the Faceless Men under the best of terms. Even when she encounters Nymeria in the woods on her way back to Winterfell, her own former pet turns down her invitation to join her.
Then, even when she’s back among her siblings at Winterfell, she keeps to herself. Upon her arrival, she slips by the two guards who were supposed to escort her. When Jon asks where she is, Sansa says something to the effect of “She’s lurking around here somewhere.”
Besides … [MAJOR SPOILERS FOR SEASON 8 AFTER THE JUMP BELOW]
Besides, now that Arya has killed to Night King and saved the world, it makes sense that the writers would kill her off. Having her be instrumental in Cersei’s defeat (if indeed she is defeated) would arguably be redundant. Arya has already affected the show’s overarching story like no other character; now should be a chance for another character to drive the story’s second major denouement (the conclusion of the War of the Five Kings).
And Arya is now more of a fan favorite than ever, and Cersei is the new Big Bad. What better way to underscore Cersei’s villainy than to have her kill humanity’s savior?