It's obvious that Ed Harris' character isn't dead, the main proof is shown when Teddy is assisting the share holder by shooting the bottle off the other hosts head. It shows the precision capable by the hosts. When Clementine shoots him in the arm, the shotgun has more of a spread than a pistol so she obviously wasn't aiming to kill. Also, her core programming was the first to be changed to allow her to kill guests. I'm thinking that MiB Ed Harris is a host or maybe an avatar for his consciousness. This would explain his urgency to cut the rope tied to the horse meant to hang him. If he were human then the AI in the horse would not have been able to kill him. The whole reason he was trying to find the center of the maze was to bring true life or death risk to Westworld. So if my avatar theory is correct, then Ford, Arnold, Theresa, etc. are all still alive.