Not sure if this is an upcoming storyline in the comics, but looking at the setup in Woodbury, I have to wonder why Rick and the gang aren't trying to do a similar thing themselves-- find a main street in some small town somewhere, block off either end to keep the walkers out, and then live comfortably inside. Doesn't seem all that complicated.
Obviously food would still be an issue, but the people of Woodbury obviously figured it out so they probably could too.
At the time they came upon the prison, Rick had considerably less numbers for fortifying a position like that than the Gov. did. The protection the prison walls & cells offered seemed pretty worthwhile