It already ended.
See...the best part of any great character is that they never betray their origins or their being. Breaking Bad was good in part because the characters never did this...and this extends to Sopranos and The Wire. The characters stayed true to themselves ALWAYS. All these shows ended exactly the way they should have.
For Dexter, how many times did we get told The Code...season after season after season. The most intersting part of Dexter wasn't that he was a murfered, but that he adhered to The Code. It defined him, and not stabbing people.
This last season, there was no code. No real inner dialogue...no inner tension, so self evaluation and zero conflict between the inner good and evil is what made the premise of the show so good to begin with.
And for fucks sakes...none of the original crew were in this show. I loved the color commentary that was Angel and Masuka and Deb. Sure, we briefly got Deb, but she was out of character and not herself.
Instead we got an improbable police chief and some random other characters and a serial killer that was about as dangerous as a brillo pad.
They REALLY blew it with this season.
THE CODE MOTHERFUCKERS. They forgot THE CODE.