Honestly I see nothing wrong with using some ideas from FFXI. And note I said "ideas." Meaning they can be changed in a new way to fit with the FF franchise.

Also, I think it sucks that they reduced the amount of party members to 8. I liked the idea of having 15 members in a party for large-scale content (but of course there is none of that yet). I would be thrilled to see some kind of alliance system and an addition of content needing tons of people. Of course, though, doesn't need to happen. Having huge content just for 8 people is good enough.