With sites closer to Vegas, travelers can charge up there, visit Vegas and run around the city, and have enough range to make it back to the SuperCharger. No need to charge up in the city.
I was in Vegas last weekend, traveling from San Diego. Lots of spaces open at all the Superchargers along the way.
Charged up in Barstow while having lunch at Chillys.
Used both of the Superchargers in Las Vegas, as I made a side trip out to the Valley of fire and went to the air show at Nellis Airbase.
The Northern charger is in a scruffy part of town, located in a ground floor parking garage. Saw one local guy drop off his car, take his bicycle out of the hatch, and ride away. Car was still there, and plugged in when I left.
The Southern one is in a much nicer part of town, in a higher end shopping center with lots of stores and restaurants to visit while charging. I was the only one charging there the whole time.
Vegas is going to be well served with charging options. Think Eddie's World is going to be a hit with the families making the trip.