Right now we currently have 1000+ pages which includes classes, disambiguations, etc. but in my estimation, I think the wiki is going to have to get to 7000 pages sometime in the future if we are not lazy. Why?
7000+ pages especially for all the items: weapons, costumes, armors, potions, food/drink, misc, etc. it's too much to do anyway. But there's more: Eidolons that will keep coming and classes that will be released soon again. In addition, new battlefield PvP and locations, even instances. We haven't really explored the Sky Tower all the way to the 100th floor yet, so expect more monsters and pages.
Excuse the 7000+ pages for items, quests are never yet finished, including monsters. I'm assuming that if we were to finish the whole wiki, it will be over 10k pages or more @_@.