The 6 lane Leaside_Bridge opened on October 29, 1927. The bridge wouldn't have to be Vancouverized, or narrowed, if a bus & bike bridge was built next to it. Turning the Leaside_Bridge into a 5 or 4 lane crossing would be like taking the backward BC approach to things.
The 6 lane Aurora_Bridge opened on February 22, 1932. If a bus & bike bridge was built next to it, that would greatly improve the overall crossing area. However, some people would like to have the 6 lane bridge, Vancouverized. Funneling it into a 5 or 4 lane choke point is a BC type of approach that Washington State should avoid.