I'm genuinely surprised opening a GC in Ishgard wasn't part of the bill when we were promised some more stuff would be added to the current roster. The timing is right, and it would make economical sense to retool the army of Ishgard now that the "kill dragons on sight!" isn't a deal.
Even if Aymeric wasn't the leader, Lucia exists as a possibility.
But, I guess since it would (/gasp) removing the 3 pronged GC PVP restrictions to work...