If they're going to create a pet/mount system where we can fight with our chocobos, then just make a pet/mount wyvern that is exclusive to Dragoons and has the same penalties/benefits as fighting with some other type of pet/mount. That way people who want to be FFXI traditionalists can have their wyvern and it won't affect the balancing of the class at all because it will be part of a system that is available to all classes.