I don't think the winner of the game is the point anymore. I think the message is that the game is evil, and will corrupt everyone that plays. Think about how much everyone was willing to do to win. Stannis killed his brother and daughter, and led his entire army to defeat. Ned Stark picked a fight he could not win. Renly unleashed the forces that would kill him. The Tyrells backed one, then another, then a third player, and ultimately lost everything. Same with Dorne. Cersei was winning almost the whole time, and she died anonymously under the city, her body never to be found.
The Starks may end up winning, or maybe Danaerys will, but whoever wins will have the blood of almost all of Kings Landing on their hands.
I like it.