This is why we'll never see races that deviate from being at least somewhat based on the 5-6 we already have.
Practicality: Having to redo every single piece of armor and jewelry as well as every single weapon to work with this new race.
Lore: "Beastlike" races are discriminated against in all of the cities to the point of it being a major obstacle all the beast tribe quests have to surmount just to not be killed on sight by everyone. The quest "Hostages to Fortune" is pretty much all the evidence you need as to why beastlike races would never fit in. And that's before getting into the Ul'Dah situation.
Popularity/Marketing: Let's speak plainly here: The majority of people do not want to play something they perceive as ugly. They want "Cool," "Handsome," "Pretty," and/or "Cute." Given the enormous undertaking that is creating a new race, it has to carry at least 2 of these aspects with it while still being something the players can at least relate with.
There are many games that actually encountered this problem with races they have. For example, TERA online has a disproportionate number of players playing Castanic, Humans, Elin, and elves when compared to the other races, to the point many people often forget the Aman and Baraka races even exist.
In EQ1 and 2, it was the trolls and ogres that had this issue. There are definitely players that choose to play them, but the vast majority of players play literally every other race. Hell, the 3rd least played race, gnomes, still had more people choosing it than ogres and trolls combined. It's also generally understood that Ratonga (rat people), Kerra (cat people), and Sarnak (bipedal lizard-dragon people) are fairly underplayed.
When you're designing a race for a game, especially for an expansion that people will be paying cash money for, you want to make sure everything is as attractive as possible.
For NA gamers, maybe the six foot tall gecko is worth the price, but if it doesn't match the aesthetic of the game, it's not going to happen.
Let's do a little experiment. I'm going to put out a group of pictures from different games, but try to keep an odd one out to prove my point. Pretend these are concept art. Which one does not fit the rest aesthetically?
This is the real reason we'll never see anything "unique." Everything must fit the game's set aesthetic, and the game's set aesthetic does not include the players running around as actual dragons. There's already a game for that (and it kinda sucks. It's called Istaria if you're curious.)