17 month sentence is fairly long, could be longer though. Horrible act of violence from a so called "professional driver". There should be separate bike lanes, the left lane was empty at the time of the incident. Lets face the facts that separate bike lanes, traffic lanes, sidewalks are best. Just read over this website blog from the Netherlands.
As for Dunsmuir Viaduct I think it is fine like it is. Cantilevering bike lanes more than the width of the inadequate width like the ones on the Alex Fraser seems difficult. Is it even possible to have 3m + width? It is worth investigating though. Rogers Arena sidewalk areas would get in the way I would think.