This helps explain why an "afk kicker" won't work to make it so that more can log in. http://www.reddit.com/r/ffxiv/comments/1l7n5x/

Seriously, people need to try to understand how this all works rather than trying to go from an uninformed perceived "easy button" idea to fix things. Even if they put in an afk feature, people STILL would have the same exact problem in the same high numbers. Capacity is set at 230,000 concurrent users - with a current estimated need of 350,000 (which is probably still wrong). Do you honestly think there are tens of thousands of afkers? Or, just thousands with only a couple thousand who can't log in?