I think that this idea is fanatastic, but not likely to happen. Like a lot of people have mentioned, WaW's time has come and passed. While it is one of my favorite CoD's of all time, you can see how the above is true when you look for zombie lobbies in game. I am very surprised that there are still mods coming out recently like: realism 3.0, malibu drive, DBZ mod. These mods and maps keep the game going and it is because of T4M, and the creators of these maps that WaW survives. I hope that we can get a new, fresh take on some mods/maps by doing a collaboration between mappers on some crazy map pack/mod but I don't know the chances of that happening either. If they do happen however, I have some good ideas for some maps.

I think what you are looking for is the Zombie Realism mod, you can start off with 4 different classes. Each class has pros/cons, support gives you ammo boxes. Each class has a custom create-a-class before round 1.

Link: http://www.zombiemodding.com/index.php?action=downloads;sa=view;down=1817

     OG Maps
Dead Sand Elite
Berlinbank v2
UFSO
Zombie Realism v2.2 Map Pack 4
All ZombieChickenTaco Maps

     Newer Maps
Cheese Cube Unlimited
Dead Ship
Malibu Drive
MW2 Rust
Stairway To Hell
Super Mario 64
Realism 3.0
xSanchez78's Der Riese mod

I have recently gotten back into WaW Zombies, and I am looking for some teammates to play some custom maps/mods with. I used to play WaW a lot back in the day, even tested some maps like chemplant_elite and nuclear_silo. Anyway, shoot me a pm if you wanna play or just add me on WaW: skaterdude36