Awesome Story but..... I wish a different route would of been taken!
Imagine a massive online 3rd person view role playing game where players can choose to help or betray one another as they strictly follow the main story or/and choose to survive an endless amount of side quests while getting to go on the occasional zombie killing spree!.....
And get to create they're own main character!
blah blah blah too many players in the game to make the post apocalyptic world seem real easily fixed by creating an amount of people per world and if a team or deal is made between players simply handle it like they do all games.... ask to join in on game!
Annnnd..... If your guy gets a bite in the arm or leg you have the choice to cut it off, be a sissy and reset your game or let him turn and control a zombie for awhile or just let him die and then restart...