Not strictly Sydney related - but saw in the Japan thread they are opening up 30 Superchargers, with the first 2 being in Tokyo and Totsuka (about 45km from Tokyo centre). Given Japan's lack of garaging facilities and low rate of "house" (as opposed to apartment) ownership, it seems to make sense that they would build the superchargers in cities to help their clients charge.
However, this would seem to be a compromise for me, because one of the great appeals of owning an electric car is being able to charge at home the majority of the time, and not have to go to a petrol station. If my only option was a supercharger, it would be like going to a petrol station every week, but I would need to stay longer. Having said that, the Supercharging is free - so obviously that makes up for a lot of it. Anyway, I guess you have to tailor your strategy to your market.
That's why Australia is such a good market for Tesla, because we're obsessed with owning our own piece of land, and many can therefore access at home charging, whereas in many parts of Asia, it's not as easy.