Ted, the Tesla employee I mentioned earlier, told us at the event that it was very easy popping up those temporary superchargers. He indicated that the lack-of-infrastructure argument is a bit of a joke as, apparently, if you have a light pole on your street, there's typically enough power available there to setup a supercharger!
Oh, one more thing that he mentioned; if you have a 60 kWh car (as Kip and I do), mating it to 19" Michelin Pilot Sport tires will apparently give you the best-handling vanilla Model S short of a P85 or a P85+! With the lighter weight of the 60 over the 85 and with the sport tires, the 60 would do well on the track, according to him.