I personally dont think they should add new races only because they already made them and I like certain races to be with the games they were made, however they DEFINITELY need to add Male Mi'qot's, Femal Roe's, and Female Highlanders!
FFXI Limited genders because of the storyline, this is a new game and new story! So the roes dont have to reproduce asexually, and we can have as many male miqote as we want! Same with adding female highlanders!
Either that or go ALL OUT and make every race from every FF game and make this like the ultimate online FF game! In that case though it would have been cool to make an online battle system similar to the classical offline rpg take turns style :)