A new problem, but one that has been stated before: The Echo. When someone with the Echo is killed, they take over the closest living creatures body and are reborn anew. With a robotic race, does this mean they become human again? or do they go through the painful process of replacing flesh, bone and organs into what makes them robotic? If they can only take over what is the same as them, then... I'm sorry, but this race can NEVER work.