True, but Fatso's lost control of his own series ending, timing-wise at least. So maybe they'll be tamed relatively sooner rather than later (assuming I am right folks---this isn't spoiler stuff, just speculation). It's gotta happen eventually. I mean, the Game of Thrones is just a distraction from the more traditional fantasy battle with the Others in the North---the Song of Ice and Fire.
The more I think about it, the more I think you're take is going to prove predictive and HBO will clean up Martin's messes. HBO has made me more interested in the story than Martin himself now. I never thought that'd happen, but it has, likely because I can see a light at the end of the tunnel finally. When you start a story in the 90s, and the penultimate book doesn't even have a release date in 2015, that light is very welcome.
P.s. I agree with what you earlier wrote about Martin losing control too. It's not the writing, as you said, because he's a great writer. It's the editing, which has failed to rein in more and more tangential plotlines. That's actually not uncommon in fantasy writing because the genre is basically all serialized novels. Often, when an author blows up based on an incomplete work, he gets too big for an editor to control and the incomplete series tanks a bit. I'd say even J.K. Rowling slipped once due to that phenomena---her 5th book was a tome of teenage angst needing some good scissors to cut down to size, but who was going to tell her?