I WAS ABOUT TO POST THIS SAME IDEA!!!!
I know World of Warcraft uses 15-20 minute idle timer which works great because if you are away from a game that long then why should you be able to stay in locking up the servers...this is complete bullshit that we have to wait until off hours and even then still have a queue to wait? You go in any major city or sanctuary you see roughly 10-55 players idle and have yet to move. This limits the potential of players like my boyfriend who is on the fence if he wants to pay the sub and honestly Square Enix he is very upset with the lack of being able to get on.

This should have been the #1 solution to server issues!!!! No idle timer indourses players not to log out and just stay logged in especially since you can collect rested experience logged in.