While this may point toward the series ending without Dany or Jon or one of the other most popular candidates sitting on the Iron Throne, it does open the door for my crackpot theory that the show ends with the surviving main players realizing that none of the horrible things that happened in the last two generations would have happened without a monarchy, and they therefore decide to give democracy a shot.
Maybe the fact that nobody takes my theory seriously means that it fits the bill for Sophie Turner’s “unpredictable” ending!
Sophie Turner didn’t give away any details or tease any specific plots that will be especially unpredictable, but her words are enough to tip fans off that they should probably expect the unexpected.