Depends on which circumstances you have to use Living Dead. I almost never use it in dungeons with random healers, and a lot more in savage/extreme content where healers know they'll have to deal with Walking Dead when the big tankbuster happens. So the healing requirement is not really a problem from my point of view. Even if they remove it, there's still a healing requirement, because you can't stay at 1 HP when Walking Dead goes off (when a boss auto attacks for about 15k damage every 2 or 3 second, you better be at least at half HP before the invuln goes off).

Why not getting rid of Dark Passenger's MP cost. It's an AoE damage ability right now, but it could be back in single target rotation with lower MP cost. I would prefer seing changes on Sole Survivor, and less animation lock or more range on Plunge.