It's already been established that there might not ever be a cure for reanimation, but what about the bite itself. The bite itself seems to be like a deadly pathogen or a poison that enters the body and kills the victim. I'm thinking that if scientists can either extract the poison from a walker's teeth like a snake or examine the blood of someone who has the virus in their body they can reverse engineer a vaccine. It won't stop the dead from still walking, but at the very least it'll minimize it to the point where you'll only have to worry about Walkers that "wakeup" after dying from natural causes, but to be fair that may not happen because almost every single doctor ends up DEAD!!!