The pessimist in me says they are leaving it till last so they can cancel it later based on any number of excuses be it existing rail links, not being able to handle the extra load, the lack of urbanity at Silver Dart Drive, etc. The optimist in me says they are leaving it until last so they can rethink the connection and branch off the line at Martin Grove to go to the airport in a more intelligent fashion. The realist in me says perhaps they are waiting to see if traffic at Pearson picks up spurring further phases in the Airport Development Program to see what happens to Terminal 3.