The main reason why NA doesn't get a convention is because the fans and playerbase here hasn't organized one yet. All it takes is a committed group of people, probably not even larger than a FFXI alliance, to get the resources and together organize a convention. It would be something to stir up the fandom for something more, most definitely, regardless of the size it initially took.

When there's a need or even merely a strong desire, people step up to fill that need. In the beginning FFXI did not have a wiki, or a podcast, or official forums. We didn't wait for SE to give us those things, we tackled those needs/wants ourselves.

We don't need to wait for SE to hear our whining and complaining about a regional/local convention, we need to wrestle ourselves away from our Magian Trials and Voidwatch for a little bit and make our own.