Why limit it to two? I mean if we get to choose between them for our mounts, I can see Wyverns being a possibllility as well.
Of course I'll be riding a Magitek armor. But If they're going to make mounts battle ready (which it seems they are at least with chocobos if the mockup is indicative of their goals) then it allows Wyvern fans to have their service while not harming the balance of the Dragoon itself.
It'd be a compromise that adds to the depth of the game while filling demands of both sides of the debate. Having a Wyvern pet out wouldn't harm the player's output any more than having a chocobo out and fighting with you, and would be balanced on the same mechanics.
From the player reactions, I don't see Dragoon getting Wyvern, and that doesn't bother me. But with Yoshi-p already in mind to make mounts capable to aid in battle, I don't see why this opportunity can't be capitalized upon to keep the base that wants to include Wyverns as part of their Dragoon's adventure.
Why is it absurd? It's part of Dragoon history.
From
FF Wikia:
"In their first appearance, Dragoons are not a Job but
a group of spear-wielding dragon riders who fought alongside wyverns. The Emperor killed off most of the group out of fear, leaving only Ricard Highwind and his adopted son, Kain."