I'm not even sure I'd want one for this series. The show has always been about power and the abuse of power.
Several character have been deeply invested in ending that cycle of abuse. One of them, Varys, has already given his life for that cause. Danerys, who wanted to break chains, is going mad and is now perpetrating the very abuses she once deplored. That leaves Tyrion, a clever and insightful man masquerading as a wanton drunkard (although the clever part has been seriously eroded by bad writing for the past few seasons). He's the one voice left passionately championing the cause of compassion and justice.
There really are only two resolutions that would make sense for the series, but the writing has been so bad this season that I'm not certain we'll get either one. We either see that the cycle can't be broken -- at least not this turn of the wheel -- or someone truly remarkable breaks it and becomes a just ruler. Unfortunately, there aren't any likely candidates for that position now that Dany has gone postal with her dragon. Jon Snow is dumb as a rock, Sansa is one bright cookie, but I suspect she would become a version of Cersei if she ascends the throne, and I'm not sure anyone would follow Tyrion, even though he is probably the most qualified of all of them. He seems more comfortable as a Hand to the ruler, than as a ruler himself.
If that savior turns out to be the snorefest known as The Three-eyed Raven, I give up on the series.
tl:dr - I have no clue how anyone could possibly wrap this up in a satisfying manner.
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