Not everyone in this game is a math machine who only seek results and utility, and ff is the saga with the bigger variety of classes i have seen, if they stick to classic niches it will not only be a big disappointment for the fans, but also another strike to the great potential of this game. If you ask me the niches they have to cover are a lot, just open a wiki of any ff tactics and take a look, there are all or some of the "niches" they should cover.