It'll give the FFXIV-lifers something to do instead of complaining there's nothing to do! Aka: kill lowbies, smack helpless NPCs whose only job in the world is to be right-click bait for the MSQ, shout in zones 30+ levels below them to antagonize other players... are you seeing a trend here?

Structured, instanced PvP is fine, it lets you scratch that itch and do so in a "fair" setting.

World PvP is really just a way for bored players who capped their tomes in 3 hours on Tuesday morning to have something to do the other 6.5 days of the week... at the expense of other players (which is WAY against the atmosphere Square tries to establish...).