I have too, over the phone =/ However, I was told that it was because it was "impossible" to perform. In other words, it would need to be a decision made by the developers if anything were ever to happen.

After repeated suggestions sent to Square Enix, I decided to try my luck with this thread. If it were hypothetically possible to implement with no difficulties (due to RMT, subscription fees, add-on/expansion content, etc), I haven't heard anyone express negative feedback on the matter (both on the game and so far on here). After some people here suggested simultaneous log ins, I don't think any of those difficulties would even exist.