I'm big fan of FF however I'm also big fan of PVP, while we might not get PVP system soon, lets give Dev Team something to think about, and maybe even consider to implement in future My Idea and vision for PVP in FFXIV would be more about fair and square Tournaments rather than random killing.

1) I'm sure many remember Final Fantasy 7 - Battle Arena it was cool right
http://www.youtube.com/watch?v=ifzVjY3I4C0 Now what about implementing system like that in FFXIV exept we won't fight against monsters, we will fight against players, maybe monsters could have some role there as well Every player would have to register for fight, there will be prizes to win, depends on ranking match etc.

2) Another thing I would like to see being implemented is Team PVP, I realize that Battlegrounds like in WoW will not work well, however minigames like in Aoc might actually work good in FFXIV.
http://www.youtube.com/watch?v=u0I3q4dARFs&feature=related

3) Open World PVP, and I don't mean pk, ganking etc, I mean possibility of having duels everywere we go in game, I'm sure it would bring a lot of fun, and players would find cool places to do their own private tournaments, fights etc.

4) The only thing left 4 me is some kind of Reward PVP Points System, for which we could probobly buy PVP gear etc, but that I guess I would leave to Dev Team