My sentiments concerning PvP are close to those already expressed in the thread. There's a time and a place for standard PVP, but I don't think that FFXIV is that time or place. Leave that variety of PVP for games designed with it in mind (such as Aion, which I adore).

However, I do agree with Rentalhamster (which is a rare occassion!) that a card or strategy game based PVP system would be wonderful. Something like Triple Triad, as already mentioned, or better yet, give the current Parley system some actual depth and progression mechanics and allow players to Parley with one another while putting items up like you do with the NPC (ie, both players put up items and/or gil, and winner takes all).