This is an extremely interesting question and as you know the path down the road for a solution is highly complex. In fact myself and Mo were discussing this this morning. So please forgive me if my answer is somewhat lite or comes across as deflective but i would prefer the surroundings of a pub or meeting room to really get into this one.
I think online worlds are amazing in that they house different societies or player types if you like. I think it is only natural for players to gravitate to those who they feel are like minded, and i think it is also only natural and in some ways quite healthy to have a macro society or community that doesn't always agree with one another. I think that diversity is exciting but it can also fragment so a method in which different groups of players work with others in synergy each enjoying their own diverse game play that is rewarding because of the game play is certainly a step in the right direction. Reading this statement you will no doubt be thinking that the FotM doesn't utilize this philosophy and you would be correct. Moving forward progression and rewards will be inter woven appropriately into the core systems and social aspects of the game, allowing the diverse societies or player types to work together by playing the content that they love.
So in short something that is universally enjoyable as a progression system or a reward should be as accessible as possible and cater to the different ways our players consume the game but in a manner in which the Community of the world as a whole is contributing to each others overall experience.
If you would like to talk further then pm me and we can discuss in game.