Which are early signs of what other super charger locations will be like once enough cars are on the road. California is having these issues because it is BY FAR Tesla's largest market. If the Model III is as successful as Tesla hopes, those issues will start impacting other areas (and other areas have already been affected, as can be seen in several threads here and on Reddit). Plus, Tesla has to worry about CA issues because, again, it's by far the largest market for Teslas so far and I'm sure Tesla aspires to have Teslas be as in demand everywhere as they are here. California's issues today
And even if only a few areas had long waits only during popular travel times, that's still horrible optics for Tesla as they try to appeal to people who aren't EV fanatics. Their claim that super chargers enable long range travel with only a Minor inconvenience compared to ICE vehicles takes a big hit with people who are neutral to EVs or even those who are just interested but not true believers if people who want to travel with their families for road trips encounter crazy long waits. It won't matter to them that it's only during holidays that locations are busy since the rare road trips they want to take will be during those same holidays. They're popular travel times for a reason.
Tesla is smartly preparing for the future. It's possible that Autopilot 2.0 and snake chargers will be so advanced they can automatically manage queues, but that's extremely doubtful for a whole host of reasons in the near future (liability towards Tesla is a car is damaged while moving, liability towards Tesla if a car ISN'T damaged during an automatic move but an owner claims it is to try to get previous minor damage repaired for free, the fact that Tesla would have to somehow convince property owners to give them more free spots designated solely to Tesla cars to handle super charger overflow, plus the difficulty in actually implementing software that can handle parking lots with all the foot traffic and unexpected situations that can come up many of which would involve pedestrian adults and children, etc). Tesla can try to depend upon social engineering and the good will/public shame of its customers which is unreliable and, as anyone who has worked jobs that involve dealing with numerous members of the public knows, a decent percentage of the population is comprised of entitled assholes who give no craps over how their actions affect others. The easiest way would be to implement a system to charge owners, not only for power, but also for idle time at a charger.