I'M FREE, DAMMIT: Well. That was rather bleak, wasn't it? With no exceptions that I can think of offhand (except for maybe Sloan, but he doesn't exactly have arcs), the Grey's Anatomy season finale pretty much rebooted every single character without rebooting the show itself. All while leaving the door wide open to eliminate a character or two over the summer should negotiations or the impact of public and/or network opinion so require. Nicely, nicely done.
Edited to add: And, as always, one can go here to read Shonda's take on it all.