Goobbue Mount

[Felis]

A "seasonal event" implies the event repeats on a cycle (like seasons themselves). Exclusive items are handled in many games this way actually.

The events, yes. But not the rewards. Like Christmas event:
2010 - Santa suit
2011 - Rendeer suit
2013 - Snowman suit

For the Goobbue, the event was a one-time, the reward should also be a one-time.
It was a part of the 7th umbral era story.

Ne'er till land consumes sun can sea bear moons.
Heavens spew crimson flame, hells seep black dooms.

I have walked the four corners of Hydaelyn, from the Gardens of Xarakish, to the floating lakes of Voor Sian Siran, but never in my travels have I encountered such a fell prophecy. One need not be an oracle to precise the great ill which casts a shadow across this forsaken realm.
Yet...perhaps there is still hope for Eorzea.
When I arrived in this land, I was beset with peril day and night-forced to endure countless trials which tested my mind, my body, and my faith. And I am not ashamed to admit that I would have faltered, had it not been for the help of a handful of nameless adventurers much like yourself.
Honest men and women who proffered the hand of friendship to a weary soul and led him safe from the darkness. I pondered long over how I could repay the kindness shown me...only to find the answer in the most unlikely of places-the final verse of the selfsame song that had so haunted me since my first days in Eorzea:

Souls from aether far, strangers from strange lands.
Yester with thine eyes, morrow by thine hands.

Had the gods led me to Eorzea for a reason? Might I serve a higher purpose, through which lives might be saved and order restored to the realm? I hoped that it might be so. For what better use may a man's life be put to than to serve as an agent of divine intervention? ...But in what manner was I to play my part?
Seeking an answer, I prayed for twelve days and twelve nights until at least I collapsed of exhaustion. However, it was at this moment that I was blessed with a vision-a single-horned beast leading a flock of chocobos from a burning forest. When I awoke from my reverie, I knew what I must do.
Once, long ago, I was summoned to a wealthy satrapy far to the east to play in the royal court. When my performance was complete, the High Satrap was so moved that he offered me anything I desired in exchange for one more song. I humbly accepted, and for my reward requested knowledge of a secret that had been kept by the satrapy's military for generations-their method of taming goobbies.
Needless to say, the High Satrap was initially reluctant to grand me that which I had requested, but being n honest man, ever conscious of his obligation to set an example before his subjects, he soon relented and acquiesced to my terms. Since that time, I have kept his nation's secret, but now believe that as the sixth sun wanes and seventh moon waxes, it is mete that I should pass it on in hopes that the knowledge may be made to serve us all.
With this horn, may you lead us from despair, and help us in a new age. I put my trust in you, adventurer. Do not let me down.

And it was a reward for the people who remained ingame after P2P started to experience the 7th umbral era story. It came ingame shortly after the P2P started and long before the Legacy campaign.

To propose that this item was PROMISED to never be available again requires sourcing. Dev posts stating when the event ends is not good enough.

[dev1296] The goobbue mount has been added.
* Please note that the goobbue mount can only be obtained before the release of FINAL FANTASY XIV Version 2.0.

http://forum.square-enix.com/ffxiv/threads/35688

We would like to take a moment to inform you that the goobbue mount will become unobtainable upon the release of patch 1.23a. Those adventurers who have yet to acquire the goobbue horn with which to summon their very own towering seedkin steed are urged to do so with all haste!

http://lodestone.finalfantasyxiv.com...db74c478bf55ee

Discontinued Content in FINAL FANTASY XIV: A Realm Reborn (07/27/2012)

As previously announced, the goobbue horn, which is the item used to summon the goobbue mount, will no longer be obtainable as of the release of patch 1.23a.

http://lodestone.finalfantasyxiv.com...0c9127bfe4e624