Why did he disappear?
Because TSM stopped playing him? Because Genja hasn't run him AD lately?
I'm not being cynical I'm just not sure what happened to him =P I didn't notice any hard nerfs, maybe some hit under the radar or something but such a versatile pick suddenly fading out into obscurity seems odd to me. He functions as a top laner, a mid laner, and an ADC, and he's not exactly an unsafe pick in any of the roles, as well as adding legitimate teamfight power. Not only that but you can first pick him, and leave your opponents guessing.
Is he suddenly just too weak or something? Other laners just do the laning better?
Who killed Kennen?