(I hope you guys can make sense of what I am trying to say here)
Totally understand what you're trying to say and I agree. However I believe the political war and the war for good vs. evil eventually have to merge into one or at least be in acknowledgement of each other.
Basically I have two main observations/hypotheses:
1. Dany and her dragons must (at some point) in the next book get to Westeros to retake the Iron Throne in the name of the targaryens. (Whether is her and/or Aegon that sits the throne remains to be seen, though I think a shared rule would be awesome.
Dany will eventually find out about the cold threat to the North and the Long Night (winter) and defend her newly won realm against said threat. As the books continue to say that the best weapon against the Others and their wights is DRAGONglass. (Obsidian) Im guessing dragonFIRE will work just as well.
2. Obviously Dany still needs to find some way to control her dragons, I think if she manages to get them across the many leagues to Westeros, Aegon and Bran could be the ones to control Viserion and Rhaegal. Bran would obviously use them to defeat The Others and Dany (im assuming judging by her character tendencies) will want to help as well. (after the throne has been taken). I think a great conclusion to the series would have to be something along the lines of a good vs. evil fight. The only power in GRRM's world that could possibly create a peace amongst so many warring sides would be a common enemy against which all citizens of Westeros must unite against or die.
Just like Robert discussed - one nation united under one ruler to make one army.