At the beginning of 2.0, legacy characters were given for a complete Character re-creation, which was basically the Fantasia plus name change.
I bet any returning legacy player today would still have this option available to their legacy character.
It's already in the system, and I don't see it affecting the game balance or system load in anyway.
The question is whether SE is planning to separate this option by creating a potion of name change or something like that, to sell (read:extort) us for more money.
Come on SE, since you are already planning to SELL us the Fantasia, you might as well just throw in a little more bonus feature to make the purchase more worthwhile