I dont think anyone here is saying that FFIX isnt a good game - just that the blackmage-automates arent a good "race-fit" for FFXIV.
Seeing how their basic design consist of (basically) two things, I can see why:
(1) The siginature BLM-robe - we actually kinda got that in the form of the latest BLM-AF
(2) The lack of a face and instead having this black, void space with two yellow glowing eyes - this also only works well in combination with the giant hat they're wearing
Other than that, they seem like humans (or in Vivis case: closer to lalafell) - nothing about them is unique, in terms of movement or features if you take away the robe and the void-space-face. They have the same statue as humans/lalafell, walk the same...
Now, what happens when a BLM-puppet wants to play a tank? And for that puts on some tank-armor? Bäm! The signature BLM-robe is gone and hes different from a hyur/lalafell how? By having a black cloud instead of a head?
And how well does the "black cloud for a head and no hair"-thing work in a game where people constantly ask for better customisation-options? (Actually, it would work GREAT for the dev-team - no need to give BLMs any options besides height, bust and eye-colour - no hairstyle, no facial features...)
What you're left with at this point is the lore - which sounds intresting enough, but seems to be more suited for a "beast"-tribe: Puppets coming to life, becoming selfconcious and founding a nice little village (sounds familiar?).
Now, I'm not 100% if having the echo requires you to also have a beating heart, but I dont see the WoL being something else but a living creature.
The genomes are actual living creatures now - but having them in the game would basically just be a "human with monkey features"-race.
FFIX is a great game (specially the german translation for once! For ONCE we got a translation thats better than the english one! Ha! ...sorry... got carried away... seriously, its pretty damn good), no one is doubting that (I hope) - but that doesnt mean that you can just port those races over without thinking about how (or if at all) they could fit into Eorzea. My guess is: The BLMs wont fit in to well, at least not as playable race since they dont have enough unique features, specially visually. The Genomes... well, they could make for another "human-with-tail"-race. I personally consider those kind of races boring, but to each their own...