I never said anyone had to die. And really, you only count Doakes and Rita as regulars? Doakes had 2 seasons, so did Lundy. What about the key lime pie lady? Pretty much every guest star besides Lumen has bit the dust, and just because they're only in a season or 2 doesn't make them any less of a supporting character. This is a show centered around killing and death, and tons of people have died.
And you already said the rest of it yourself. He's spent the past THREE seasons accepting his humanity. Uh, what?! I'd argue that's been the show since the first season, but that's splitting hairs. Three seasons can work. This show isn't going to be on forever. How about some risks and developements that are actually new and interesting rather than rehashes? He can't kill his way out of being dumped? He needs to move on? That's what this season was for. And they set us back to square 1, more or less.
Anyway, like I said, I didn't need anyone to die. But some risky, dangerous, actual *developments* would have been good. They've built up Quinn and or Deb finding out who he is all season- it's been, you know, a main storyline- and instead of going forward with that they back out of it and attempt a cock tease at *maybe* interesting things will happen.. next time! So be sure to come back. The show is nearing it's shelf life. They've shown us a willingness to shake things up and be dangerous before...
So to have things end happy and safe in a show that's about a serial killer.. yeah. Thanks for the curve ball, guys.
If the next season's premiere is not Dexter getting discovered or caught or going on the run, I'll probably check out for 10 episodes and watch the end, content that I haven't missed a damn thing.