It feels like with the spinoff, HBO is going to lean harder into high fantasy of seasons 5-7 than the politics of seasons 1-4. But I wish they were making a show that was going to be more structured around the best of what Varys, Littlefinger, Olenna, Margery, and Tywin offered.
Espionage, assassinations, backstabbing, plotting, scheming, and international politics of the world. Since the Iron Bank and Faceless Men are international organizations, they could be the anchor to allow the series to span all of the major continents of asoiaf.
Call the show "The Iron Bank", with a plot revolving around the group of mega wealthy investors that run the iron bank. According to the world of ice and fire lore book, the iron bank has a secret council with a chairman of sorts, with both men and women making up the members. This would allow for both strong male and female characters, something GoT excelled up. The show could then be about their different agendas.
People always ask "what happens when a king doesn't don't pay back the iron bank?
Create a series specifically about what the 1% of planetos do to the world leaders that fuck them over.
They are pretty much the Illuminati of asoiaf, as the economy of most of the world powers depend on them, and they have magical face shifting assassins that they can employ to do their bidding, so the series can take place in every single region that matters, and feature people of color rulers and leaders from the areas of the world never featured in Game of Thrones.
Maybe even have some political infighting within the Iron Bank itself, perhaps a "who dunit?" murder mystery in the pilot, where the chairman of the Iron Bank is found brutally murdered in the rainy streets of Braavos. And to escalate the events, the Iron Bank itself was robbed successfully for the first time.
And what results is a "war of the five kings" sort of scenario, but it's not to sit the Iron Throne, it's to become the defacto leader of the Iron Bank, or the most powerful person in the world.
I just thought way too much about this. lol.