I know SOME people get all bent of shape about the possibility of locals parking at SC's to save a buck or two. They're also worried that there will a huge log jam when they get to a popular SC site. Well let me share my thoughts on this. I wasn't worried about this when I purchased my car (when there were only 8 SC's in the US) and I'm certainly not worried with 190+ SC's in the US.
Here's my data:
Model S Delivery: May 16, 2013
Total Miles Driven: 69,500 miles, almost 24 months
Supercharging locations visited: 17 (Hawthorne, Redondo Beach, Indio, Rancho Cucamonga, Barstow, Primm, Las Vegas, Culver City, SJ Capistrano, Tejon Ranch, Buellton, Atascadero, Gilroy, Fremont, Harris Ranch, and Vacaville)
Number of times charged at a Supercharger: 75-80 times.
Number of times I had to wait for an open spot at a Supercharger: 1
Number of minutes I had to wait: 5 minutes
I probably used Hawthorne about 20 times and NEVER WAITED. I was there during all kinds of hours, early, late, weekends, weekdays, holidays, rush hour, etc. Never had to wait. I don't go there as much as I use other locations now. Most of my Hawthorne charges were during the times when they only had 5 charging units.
Bottom line? Don't worry about what could happen! Relax and enjoy the ride