'All the maps' includes a lot of junk. If you throw out:
1) prefabs, which aren't supposed to be playable
2) 'autocompile' folder and E3 3 (everyone saw them a thousand times
3) zoo maps (nothing to do on them)
4) somehow compromise on such maps as Sawyer's 'playgrounds' (which are the same map with slightly different set of entities each time), or 'streetfire' series, or other very similar maps,
then the WCM could get down to something manageable. Even then, it'd require many months of work to make it worth anything, or splitting the project between 30 responsible people.