The FFXI engine would explode.
And it can't be directly ported because:
1 - Normal maps/specular maps. Not integrated in FFXI (they have a specular shader but it doesn't use texture)
2 - Ridiculously higher poly count. (Explosion here.)
3 - Realtime psysics clothing flaps etc. That is to say a lot of your character isn't pre-animated, and flowy things are calculated 'on the fly'. FFXI wouldn't know how to even interpret that.
4 - all-around completely different animation/equipment display approach than FFXI.
The only way you'll see FFXIV models in FFXI is if someone rips the models, downgrades the polycount/texture channels to FFXI quality, re-animates them to match every single FFXI animation (meaning it would only have one static outfit), exports it in FFXI format.
So no. Never going to see it.
Edited, Sep 9th 2010 3:49pm by RattyBatty
Minecraft : My anti-MMO
Terraria : My anti-Minecraft