Final Fantasy XIV will be horrible, it will be full of people who sit around and idle for hours on end and never play, just sit there, showing their gear off, randomly spouting 2-3 lines of text and running off again for hours.
Even worse, there will be those guys who get all excited and play it swearing it will be awesome, then ditch after a month after getting everyone they know to play it and then quit to play Star Wars the old republic or something equally queer. He'll create a ventrillo channel, a guild/linkshell/group/etc for the group and even hang around all the time after he bails too. You guys probably know some people like that, right?
Besides, the battle system is SOOOOO boring, I mean, you have to sit there...and wait for your player to attack after selecting their move. Seriously...what game does that?
FFXIV will be fun, especially since it will give people a reason to stop playing FFXI, which is so horrible and unbalanced and grindy and annoying (yet I still play it way too much).