I think you guys are missing the obvious here.
Dany has said she wants to break the wheel. She's also struggled with not simply becoming another spoke on it, crushing all beneath her until she is crushed in turn. Burning the Tarlys was a good example of her screwing up there. Jon, likewise, says he disdains politics and only cares about defeating the army of the dead, but fails to realize that you have to deal with politics to defeat them, because it's only via politics that you actually keep your force united and focused.
So, Dany needs to learn a measure of humility, and Jon needs to step up and lead for real. The solution is blindingly obvious, and Varys already told the audience what it is: Dany and Jon must be married. This serves political and military needs, not to mention those of both the plot and their respective character arcs. Dany has the strength, Jon has the compassion. Dany has the iron will, Jon has the common touch. If Jon marries Dany, AND they rule as coequal rulers, then (1) the North gets its northern king whom they selected, and (2) Dany still keeps her throne. From that position, they could move towards a Republic, if they chose to, or could at least pass some kind of document like a Magna Carta which applies to all equally.
I do think it's also worth bearing in mind that, whatever the groundwork laid out by the first three seasons/books may have been, the showrunners are mostly just moving everything towards the endgame, and have been fairly sloppy about their execution. In particular, I'm reminded of last year's "tension" between Sansa and Arya, which seemed to come up out of nowhere in a single episode immediately after they'd met and had a lovely reunion, persist briefly into the next episode, and then was revealed to apparently all have been a ruse. It was, I feel comfortable saying, probably the worst bit of writing I've seen on the show. It was so clearly for the audience and was incredibly contrived, not to mention half-baked. The set-up for it was almost nonexistent, the tension felt entirely artificial the whole time, and the payoff, while satisfying (in the sense of watching Littlefinger finally get his) also felt abrupt and poorly handled.
My point in mentioning this is that there's plenty of crap that they could be screwing up right now, which we're busy trying to analyze and figure out (e.g., Dany's Tarly-cue causing tension between her and Sam, Jon and Dany at odds with each other, etc.). They have 6 episodes total to wrap this thing up, and even if they amount to more like 8-9 episodes' worth of content, that's still not a lot of time. I would expect tensions to mount and then dissipate abruptly. Like "Oh no! Jaime and Bran are gonna have it out and then -- wait. Now they're HUGGING?!?! WTF?!"
I love this show. Don't get me wrong. But I just wouldn't hold out hope for there being a ton of intrigue and double-dealing except with respect to Cersei this season.
Finally, Cersei won't be shot by a crossbow. She'll be strangled by Jaime. Possibly by Tyrion, I suppose. Bronn will probably kill one of them, be killed in the process, and then the other will kill Cersei. I really hope that Tyrion isn't the one to die, but I suppose it's possible.
Also, we should expect that Melisandre has one more "1-up" to dispense, although to whom is the real question.