I don't know why London ever attempted to turn Dundas between Lyle & Adelaide into a pedestrian mall. That area if anything has too many people of disrepute hanging around there. If anything they should make Dundas 4 lanes from Wellington to VMP!
As for downtown, just do those car free deals to weekends or summer days. The rest of the time it would just be another locale for OW recipients to loiter downtown and drive families away. Leaving the possibility for LRT open would be good, but seems as likely as us getting a ring road
Though the city should re-route all buses on Dundas to King & Queen, why clog up the street with 20 buses pumping emissions in a narrow area. Most people can use the exercise and walk a block anyways. That would help in dispersing the people who loiter on Dundas!