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I have to disagree with you on this one, Pyro. I think setting up Deb here as a total change and transformation gives the writers plenty of places to go for the final season. Does Dexter finally realize how bad he's become, getting Deb involved not just as an accomplice but as a fellow murderer? And, even worse, not even a murderer with The Code. Just a murderer. So, according to The Code, Deb's actually in a worse spot than Dexter.
And Dexter's not going to like that he's put her in that position. Granted, he seemed genuinely willing to have her shoot him instead of LaGuerta. I'm thinking he felt a strange sort of relief, based on how that scene was acted -- but Deb complicated things rather than wrapping them up.
I kept thinking (we just rewatched the episode five minutes ago)... that if THIS had been the series finale instead of just a season finale, Deb would have shot Dexter. Easy wrap-up for everyone then.
So, since Dexter has now come full circle and killed *all* participants in his mother's murder, it seems the final season will be one of a lot of psychological wrangling between Deb and Dexter -- with Hannah thrown into the mix now to make any of Dexter or Deb's choices a little more complicated.
Will Dexter run off with Hannah and Harrison, leaving Deb to go back to her "real" life? Can she even do that ever again, even with Dexter out of the picture? Or, since we know Dexter's loyalty to Deb runs far deeper than to anyone else except Harrison, perhaps he won't run away with Hannah after all. Because he made it clear in the prison that he'd never find Deb safe with Hannah on the loose.
So perhaps the final season finds Deb and Dexter pairing up for one final kill -- Hannah -- so that the final choices of the series can be made. And through the Hannah-killing, the psychological wrangling will come.