It really doesn't have any impact, outside of the fact that it addresses the disparity in population. Members of the Cathedral area, even though they would be put into a new riding, would not have to travel any further to get to an MP's office. They wouldn't have to travel any further to get to anywhere in Regina, frankly.
It's just primarily done to keep the Cathedral association as one entity and to address the disparity in population. That's all it's doing. It's a minor change, in my opinion, and everything else remains the same.