It's interesting that the zombies are still moving about - how much time has passed in the storyline since the start of the series? Lori looks to be 6-8 months pregnant, which suggests that these zombies are moving around, without sustinence, for the same amount of time.
This is in addition to the zombie's cerebellum still being relatively in tact, which, without sustience, would have broken down long ago and made their writhing corpses unable to walk or function.
I believe there was a brief moment when they alluded to this in yesterday's premiere. When Rick takes off the helmet of the zombie cop, he was pretty much just wasted flesh and a skull. I think the intent was to show that the zombies are deteriorating, even if it is a slow process.
At some point the story would have to become less about zombies, and more about humans fighting over waning resources. The comic does a good job of showing intra-human social conflicts as the plague drags on.
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