In the years to come, all Londoners are going to be proud that it led the way on low-emissions policies and reducing lethal air pollution. We will look back on the argument about the newly extended Ultra-Low Emissions Zone (ULEZ) like we do on past rule changes to outlaw child labour, betting on animal fights & defecation in public places.
Of course highly polluting vehicles have to go. You can argue about the mechanisms for managing it, but not the principle behind it all.