Well, if Chocobos being used in combat is of any indication, I would hope that any other mount they add would be usable in combat as well. Though, how do you tie this in with a beastmaster job if everyone can do it? At the current pace, it seems as if each mount will have its own theme. This will make each mount a special occasion, so I can't see them pumping out 50+ mounts. In my opinion, best case scenario is B with being able to use the few available mounts in combat with customization. Second best would be B with only Chocobos being used in combat.