In the near term this may be a better alternative, but I'd hope Tesla is already thinking about larger scale hub locations, something like "Megachargers" for heavy travel corridors like this one. Instead of four separate 8 stall implementations 3 miles apart, one large 32 stall implementation would be much more efficient and could serve many more cars with the same number of stalls. For most people this doesn't make much sense, its the same number of stalls, but if you treated superchargers like call centers it starts to make more sense.
4 different 800 numbers with 8 agents each. No intelligent routing assumed and callers choose one of the four numbers themselves randomly. This will cause situation where callers are waiting in queue on one number with agents playing candy crush on another since they aren't servicing a call. Some callers wait in queue and then hang up and dial another one of the numbers, maybe getting straight to an agent, maybe hitting a bigger queue. If the agents are superchargers and the callers are cars, it's the same thing really.
This is why single site chargers, like single port CHAdeMO scattered around can't scale. Imagine a call center with 32 agents, each with their own separate phone number, and you have to choose randomly until you find one that isn't busy, or wait on hold not knowing how long the previous caller will be on the line.
EDIT: wanted to clarify, I'm not saying you meant a few more locations 3 miles apart, that was just an example of some time in the future when we are at a density that adding locations may be just a few miles down the road from each other on major corridors. Right now it certainly does make sense to add locations until a saturation level is hit.