Gift what you have to release the pc's in xiv are on the same side. That's how the world was designed so of course we aren't fighting each other. now if say LL, Uldah, and Gridania were at war with each other looking to conguest the other lands, than PvP would be a necessity. This game in that respect is not designed like wow or rift with faction at each others throat or aion between the two sides.
now arena style PvP where the best warriors test there might on behalf of their companies would be a really neat idea SE can look into to bring PvP into xiv and make it fit the world. You gotta look at PvP from the perspective of the game.