Honestly, I'd prefer Monk to get a Coeurl mount. SE has already provided plenty of precedent for simply 'recoloring' mounts and then re-releasing them, like how we've got two Chocobo mounts, two Goobbue mounts, two Magitek Armor mounts, two Unicorn mounts, and now we're about to get FOUR Horse mounts, I don't see why we couldn't have a second Coeurl mount for Monk.

I don't see Dragoon getting a Wyvern mount with their current lore, and honestly I'd prefer it if Summoner got something like Fenrir as their class mount. Tonberry mount for Scholars could be interesting, but I can't think of a suggestion for either Black Mage or Bard, but I definitely don't see Black Mages riding a snake. Maybe another Ahriman?

Anyway, that's just my two cents on this matter.