The city has grown by around 100 000 people since Crowfoot opened. Dalhousie is still a major transfer point for busses. Crowfoot has 12 bus routes operating from it, Dalhousie has 13. I think before the expansion, there wasn't much service to the far Northwest area regardless. Perhaps someone who has lived in Calgary for more than 15 months could shed some light on this
Just before Dalhousie, both Brentwood and University Stations also have high ridership, especially for an area which has 3 stations within about a kilometer of each other. These are the 2008 numbers only. The ridership has definitely grown much more than this.
Brentwood - 14 900/ weekday
University - 16 100
and then Banff Trail - 5 600
Since 2009, Ctrain ridership has increased by over 20 000 per weekday.