Statistically, site capacity increases faster than pedestal quantity, so more pedestals helps more than one might think.
brx,
Can you elaborate on this, not sure I understand what you are saying...
If there were a single stall, average charging time of say 20 minutes, then cars arriving any faster than once every 20 minutes will result in a queue starting to build up.
If there were 10 stalls, average charging time of 20 minutes, someone will be leaving a stall every 2 minutes on average.
When there are 20 stalls (presumably soon), average charging time of 20 minutes, a spot will be freed up every minute. So unless there are Teslas arriving more often than every minute, or average charging time is more than 20 minutes, queue buildup should not be a problem. Batching of arriving vehicles can certainly happen, but that is a different case then a normal or random distribution case.
RT