Scrapping Western Extension - Upsides and Downsides

So the Western Extension to the London Congestion Charge is to go. I haven't seen any statistics as to how successful it has been but I do have a general affinity for traffic control schemes such as this. On the upside it makes my trips to Opera Holland Park cheaper! (No - public transport Guildford - Holland Park - Guildford in the evening is not an option!)