There has been many post about PvP, this thread is gonna go something like this:

Yes PvP
No PvP
Open World PvP sux
PvP don't mean open world
FFXIV should open up to new things
FFXI PvP was fun and didn't impact the other aspect of game
FFXI PvP was boring because there was no incentive to do them
and After 30 or so pages it would slowly die down

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Devs alrdy said they not gonna go Open world PvP, and if PvP were to be implemented it would be arena or collisieum.

Edit: sorry i seem to jump the gun, im not sure if we will be able to fight GMs lol, that would fun.