That doesn't seem feasible. How are you going to prevent zombies from wandering in and the virus re-establishing itself? Plus I'd say it's a needless risk. Just hole up somewhere, fortify your position, and wait it out. Zombies don't breed and they don't seem to posses any survival skills either, so they should all be gone in a relatively short period of time, say a few years.
Yeah, and at this point, it all boils down to which zombie "universe" we're talking about. In the "28 days" universe, the virus is a horrifically contagious pathogen that turns it's victims into homicidal "runner" zombies - zombies that are quick. The upside of being a normal human being in this universe is that in this universe the rules are "fair" - zombies need calories to survive and their bodies are prone to breaking down after a period of time. In this universe, you could probably wait out the worst of the crisis. In this situationHowever, I add as a side note that holding up in a city is the last place you want to make your stand. Cities burn. Without any effective fire-fighting system to keep this threat in check, you'll be toasted and all that wonderful food that's stacked neatly in rows for you in countless supermarkets will be burned, crushed and eventually buried by tons and tons of collapsed and burnt out buildings.
On the other hand you have the cheesy-ass "World War Z" universe which, on the one hand portrays zombies as slow moving dolts and other the other hand "cheats" by having them survive scenarios where they would most definitely fail. In the "World War Z" universe, the best thing would be to get to one of the safe zones, become part of the war effort, and take the battle to the zombies.
Then again, in the 2004 "Dawn of the Dead" universe, the Zombies don't seem to be effected by a lack of calories, dehydration and they're "runners." In this situtation, it seems to me that becoming part of the war effort and getting back into the fight in support of major military operations would be key to everyone's survival.
I guess, it all depends on the ground rules.