I was thinking that the GC should have the ability to teleport you, of course at a cost, seals. We have very limited number of seals though D:!!!!! Well not to fear, because a long side this you can get your handy dandy signet. So with that issue out of the way. Where would they teleport me to D:??? Well, I think there should be one main "telecrystal" in each area(zone, think 2.0). The further the area is the more seals it costs.
Of course its not going to be as simple as talking to x npc just to unlock it. I think you should have to be x rank with a little quest or something. Of course he cant just teleport you without you having a key item. Probably a fragment of the crystal it self. Meaning you will have to first venture forth and "touch" the "telecrystal".
There could also be group teleports as well. Let's say that theres 8 members and the teleport costs x seals, instead of one person paying for all of it, it will take x seals out of everyone's pocket.
Side note: of course this would mean no anima or where a single class teleports, it also wont be limited to how many times you can tele, as long as you have the seals. Seals take less time gathering than anima anyways. Or the cost could be gil