Alright, perhaps you should elaborate more on the timeframe of them losing memory, general societal degredation and so forth. This is your roleplay though, so elaborate on the specific events in time that you feel is relevant.
Okay, I like the idea with the Walkers. Definitely can't wait for more information on them.
Overall you have a strong basis for a great idea here. As you continue to progress, i'll help you out with the general formatting that makes for an easy read for the OoC. I'll also help you out with any coding that can prove useful. Of course, you really need only look down for all coding options.