Could, perhaps in the future, for future Coil content..lets say after the next installment if it follows the Crystal Tower -> Coil -> Crystal Tower -> Coil (this is where my idea kicks in)..

ALLIANCE!

Seriously, imagine it. What if, say, further down the line in the Coil, when we actually get to a point that -maybe- we can face off against Bahamut it/himself, we could do so with a full alliance.

No duty finder either. All server based.

Though personally I think that the last big battle of the Coil, should not be part of a chain but be it's own thing altogether. No lock out, no grinding through multiple turns. Yes, farm-able, but it requires a fairly considerable amount of cooperation and planning by the people organizing it to get 24 people together (who, by this stage, would need to be geared and knowledgeable of the battle and tactics to just survive. And it could be, hands down, the greatest, hardest, insanely difficult battle in FF history.

Make it so!