I'm okay that this was never implemented, because they instead focused on other more useful things: Cross world linkshells, data center world travel, the fellowships (although those are not really well utilized), the pre-formed full 24 man raids someone complained about on the 2nd page, cross world party finder, friend list estate teleportation.... and so forth. I'm already in an "alliance" of sorts with 3-4 other FCs, and we just added everyone to each other's friends list and hang out in the front yard of the biggest of the FCs on event nights.

But this way each FC can sort of be managed its own way, although one of the running gags is threatening to kidnap the members of other FCs