2 things to note:
1. School traffic has definitely increased the usage of the line. While my previous morning train saw 5-6 people on it when it departed Conestoga mall, the earlier train today saw close to 30 people on the train as it departed. Student usage is also up quite a bit, with trains being Standing Room only in the University area during most of the day.
2. For those that do not know (I did not and only found this out as I was sitting in the park playing truth-or-dare with some U of T friends 2 weeks ago in the middle of the night), the freight service and iON actually run at the same time, with a freight train usually heading up the spur at 11:30, and southbound iON trains running down the Northbound track at the same time. This means we cannot rule out overnight service along the entire corridor as a possibility in the near future since freight train interactions are not inhibiting 15-minute frequencies on the line.