It's overdue.

The current measurement was originally designed when fare structure was very different from today. Any discount fare required a Saturday night layover. AC was neither flying to Asia (except Singapore for a short while) nor South America. It flew to Europe and the farthest point was probably Moscow. Partner airline flights do not count towards status - "Q" miles were AC flights only.

AC has consistently ignored moderate flyers like me who generally buy discount business class fare. I verily believe that my annual total spent has been more than some SE's especially when I read boasting posts here on how to achieve SE for spending $5,000 or less! One TPAC in business costs more than that!