If I remember right they said one time in a Live Letter that if Dragoons got a Wyvern pet they would have to nerf Dragoon's damage to make up for the pet doing damage. I personally don't really want that. My number one memory from FF11 was summoning my wyvern and it getting one shot by a bomb toss not 10 seconds after words and only being half a job for 2 hours instead of playing a MNK, DRK, or a SAM and not having to rely on a pet. Based on how they did SMN in FF14 i really don't think they would make a good wyvern pet in this game.