The 60's architecture sucked...at least its not that gross looking green anymore. They also seemed to have not considered water craft sailing under the bridge, unless they were thinking of another option...drawbridge??? That would have been cool.
Now, IF Saint John did start to grow again at a pace that warrented an alternative highway system this would require really great ideas as we do have a complex geographic area (water and rocks), that could get quite costly. But, not a great worry as of now or for the foreseeable future.