Rank 14 is the final rank for veteran rewards.

[Bourne_Endeavor]

That's why they are called veteran rewards. Because they are supposed to be only for veterans, not new players.

But it does eventually become a little silly when the vast majority of your playerbase will be waiting upwards of 3-4 years for rewards. I suspect the replacement Yoshi talked about will be a direct financial benefit of some sort; a voucher to buy something free off the Mog Station; a free month's sub. Stuff like that.