The Bus and Bike Bridge Concept isn't officially banned in Vancouver or BC in general. It just hasn't been as important as it is in other cities.
Of course it would be Calgary, not stubborn Vancouver that would have an improved Cushing+Bridge crossing. While the main 4 lane bridge could easily be just like a narrow BC bridge, it's the parallel crossing that takes it above and beyond backwards Vancouver. There is a 2 lane bus bridge with a wide bike & footpath.
Since so many bridges in backwards BC are mostly narrow, a parallel Bus and Bike Bridge would be a huge improvement.
https://www.google.com/maps/place/Inglewood+Bicycle+Pump+Track
Not just Greater Vancouver, but several cities in BC could really benefit from having parallel bus+and+bike+bridges.
https://jfdatalinks.blogspot.com/search?q=bus+and+bike+bridge