To pick up on this point, some of the longterm projects in Mississauga such as the Dundas BRT already include reducing lanes for cars and adding in more space for pedestrians, cyclists, and trees. I believe this is certainly the sentiment in that city.
I think it will be interesting to see how the various levels of resistance in city-planning and amongst residents in different suburbs at present will translate to different (sub)urban-landscapes in the coming decades. Mississauga and Vaughan, for example, seem to be more progressive and ambitious on this front whereas Oakville and Burlington aren't and opt for more modest changes with still lots of dependency on cars (when was the last time that public transit was to be majorly overhauled in those suburbs? How much resistance has there been towards increasing densities around GO stations for making complete communities that are truly walkable?). These differences will then become more apparent once the many projects come to fruition.