I don't really think so. I don't know, I go with more of Romero's take on it now. The zombies live for years just wondering around looking for food. They're DEAD. They don't HAVE to sustain themselves, they just want to.

What kills them out is decay. That's why I think it would be a hopeless situation no matter what. Unless you can fully sustain yourself for years in your own little room or top floor of your house, or even your underground bunker.