I wouldn't be surprised in the least to only see Chocobos as the mounts for FFXIV. Referencing real life, like fantasies often do to an extreme (like riding a chicken for instance), there's only one real mount in the world - horses. Sure, you can probably ride on other things, like a bull, a dog, a cat, tried a mouse once but ... nevermind ... point is horses are the only reliable "real life mount" and Chocobos are already in the game anyway, and seen as mounts, so why not have them be the only reliable mount as well? Not to mention that having one mount just recolored (when breeding starts) makes it a lot easier on the dev team as well, and I'm sure they like easy work from time to time.

But ... I wouldn't mind riding on Ifrit's head, or even Bahamut o.o ... well, a wyvern mount anyway would be cool heh.