Zombie Barricades

We love the good ol days of the 3rd person RPG, sure they are still around but there can never be enough of them and we have a few ideas on how to innovate. So, we were wondering: Can we have a 3rd person RPG that lets us team up with our buddies and play competitively or co-operately? Can we hop in helicopters and trucks together and mission around vast play areas that can erupt into warzones at any time? Can it be set in some sort of zombie infested post-apocalyptic world so we get all kinds o...