Yes, I think by and large that Tesla will have most of the saturation issues figured out by the time the expected build-out of Superchargers is completed, likely in about two years, give or take. Tesla has reams of data about usage at every location. I am sure that they know things like median, mean and mode of the length of stay and charge received. They know the times of day and week when SCs are full, nearly full, not-too-full and empty. I assume that they know the traffic counts on all the highways served by Superchargers and can combine this information with cars sold within a certain radius of the SC sites.
Barstow and Gilroy have been expanded as well in the past 18 months or so as well as Hawthorne.
There will always be outlying times when we will be faced with congestion, and Tesla should not contemplate these rare occurrences in their network. These situations would be during extreme travel times, like holiday weekends from LA - SF or LA - Vegas.
The only thing that I would implore Tesla to do in the next two years would be to have "real-time" information as to the operational availability of all Superchargers. Since I have owned my S, there have been a couple of times where a SC location was fully disabled or with reduced power. Tesla was prompt in fixing the issues (or in the case of Harris Ranch arranging for diesel generators to provide power.) I have no doubt that Tesla will continue to service their Superchargers promptly to return them to full working order. But it would be frustrating at the least to plan a vacation and wind up stranded in a remote location or having to find a trickle charge overnight in order to resume the journey, when knowledge of any disruption in advance would permit an adjustment in itinerary or travel route.