But don't you think that the best way to improve survivability, overall, would be to reduce the number of such incidents in the first place? If a doctor recommends a policy change, then he has come to a conclusion about how our roads operate. He should have stuck with the idea that it's more likely for a pedestrian to survive a collision at 40 Kmh, than at 50 Kmh, at which point he would have been able to take the money and run by publishing a foregone conclusion.
By the way, the publication in question is well in line with the former Mayor's 'war on the car' philosophy. Its purpose is to outline why walking and cycling are good and healthy things to do, that should be encouraged and increased, and so those activities are prioritized. When you prioritize an activity, in a shared environment, others must needs suffer.
http://www.toronto.ca/legdocs/mmis/2012/hl/bgrd/backgroundfile-46520.pdf