I'm not sure why people are worried about Goobbues filing up everyones' screens. I very rarely see more than one chocobo around and I'd imagine there are going to be even less people playing once p2p starts (Which means that only a small percentage of the population, come v2.0 would actually have goobbues.) The only time a group of mounts would be in your screen is when you are traveling to a camp with your party.

This game isn't like WoW where you can flood the town with mounts which is where you actually see the most clutter of mounts on your screen at once. Hell, since they are making the game a lot more centralized around instanced dungeons, we may never use our mounts.