Was thinking about this as apossible band aid to server population issues, or as a way to encourage people to move to smaller servers to distribute populations while still having access to an assortment of people to play with. It goes without saying, I'm disregarding infrastructure challenges or the welfare of the hamsters running our servers. Tirelessly.
So, my thought on global content lobby. Where people from any server can connect/enter in to find others to group with. Here you'll be able to yell, shout, chat, create global parties, and from there, access global instanced areas of content.
I'll use Sortie as an example for this.
Six people who met on FFXIAH.com want to run Sortie together but theyre all on different servers. So, all of them enter/connect to this global zone, and create a global party within it. From there, they would enter a special global instanced area of Drifts #4 where the entry Bitzer is located to queue into that servers instancing for content. This way, other servers instancing instancing isn't affected.
Of course this kind of space could breed RMT, so trade would likely need to be restricted or limited in someway - that way gil isn't transferred across servers, or items used to launder gil.