With the reveal of Fallout 4 and the implemented crafting of settlements, i see a cool pvp opportunity. There are a couple ways to do this. You can have a version like Rust where its just complete freedom. or you can have a version like ESO but you can create your'fortresses.' i prefer the latter due to focus and keep things competitive.

Going on with the 'ESO'version. How to formulate teams, im not too sure about that. But the concept is to join a team, the team starts at a vault on a large map. From there, you explore, scavenge, expand, and defend your vault. Victory consists of taking over other vaults. Defeat is when you lose your own.

There will be other small settlements with npcs. These can be expanded and built upon. So these can constantly change if multiple teams keep taking them over. These settlements offer bonuses: certain materials, weapons, and even npc support like companions--like a forward defense post that can constantly attack neighboring enemies. imagine saving enough caps for one of those giants to help invade a base lol.

the final alternative is the exact same thing as mentioned above, but you represent a faction in the Fallout series (Brotherhood of Steel, Chinese Remnants, Tenpenny, etc).

Theres more that could be expanded on but you get the idea. The main problem im pondering on is populating servers. you want people to join and be committed. this map would of course hold hundreds of people.

let me know what you think.

There's already a thread for a Future Multiplayer feature. http://www.gamesas.com/topic/1512524-fallout-multiplayer-discussion-thread/