Arya's given up on a life of vengeance, that was the whole point of juxtaposing her escaping from it as the Hound is consumed by it. I don't think she's killing anyone, or settling down at all. Most likely outcome seems like back to wandering/traveling, maybe even going back to Essos.
Jon's probably gonna kill Dany, and it's probably gonna be real hacky (the plot development, not him hacking her up). Not sure what becomes of Drogon but it seems only loyal to her so it's probably gonna go too.
I've thought for a long time there'd be no Iron Throne/monarchy at the end of the series. I'm wavering a little on that but I still don't think it'll be "let's do the same government but with a good Targaryen on top, and no worries about the how the 'gods flip a coin' will go for his kids and grandkids". A fundamental shift seems to fit the themes of the show. Jon going back North, or dying with Dany would make good sense if that's the play.