I don't think voluntary behaviors regarding frequent local charging would likely make much of a difference. Nor do I think frequent local chargers are a big enough group or a problem anyway. Enforcement could make a difference if it cuts out occasional chargers too (thus really lessening the local burden in volume), but to do that, in my view the contract needs to clearly change (and it can't for existing cars, but can for future) - and, true, that would take away from Tesla Awesomeness. But fear of taking away from Tesla Awesomeness can't allow the contract to change in silence, that wouldn't be right either.
I'm OK for changing the contract for future purchases, e.g. my future Model X included.
I also admit none of us are privy to numbers that would be needed to determine these things accurately - and Tesla is unlikely to tell us, because they have an interest in controlling such information (beyond fiscal responsibilities). We all estimate, of course.
Whatever Tesla does, I think they better tread carefully. I'm not sure if somebody linked to this already but AT&T just got hit by a $100M fine for not informing users they would "throttle" their data speeds after hitting a certain data volume within a period. This means that some of the ideas that were offered earlier in this thread may not fly if implemented on the entire population. For example the idea for Tesla to slow down the charging speed to a trickle, in case somebody reaches a certain amount of kWh charged within a certain period.
I'm going to put it out there again, AT&T's situation is not applicable to Tesla, and there is no
contract that Tesla provided on superchargers.
First of all, with AT&T people have a
service contract that specified "unlimited data" which you pay monthly for and didn't specify and limits (throttling or otherwise). With Tesla there is no service
contract that states Tesla must provide
*unlimited* supercharging access to you. Owners can look at their purchase contract, I'm fairly certain that whatever supercharger mention there is only references supercharging activation (akin to phone activation), nothing about network access or any guarantees or terms and conditions.
Where they specify supercharger details is in their advertising. And even when they do,
*unlimited* was never a headlining feature (while it was for AT&T). Correct me if I'm wrong, but so far the only place people have found that even hinted about "unlimited" usage was a section buried in the FAQ talking about battery degradation and warranty concerns. In the main advertisement, it was always free long distance travel in the headline, it does not say free
*unlimited* travel (I challenge people to find a quote where it says that). Throttling would not contradict with the "free forever" message.
So all you can pin on Tesla is false advertisement, and the chances are very slim on that given it appears 90+% got the message that superchargers are mainly for long distance travel, whereas if you poll AT&T users of the unlimited plan, I suspect the opposite impression would be there (because AT&T advertises unlimited in big bold letters). And I'll put it out there again: the FCC allows throttling because of congestion. If Tesla throttles local users during congested hours to get them to leave the station (or what makes more sense is to assign the lowest priority to them so the supercharger splits to favor a long distance driver), even under FCC's provisions it would be allowed regardless of "unlimited" advertising. I should put it out there FCC does not have the jurisdiction to regulate the supercharger network though (so someone would still have to sue Tesla).
I'll throw out an example of the contract vs advertisement difference: the $100 ranger service. Tesla mentions in their blog and in service pages (some of which can still be reached by google, although not if you navigate normally within the site) about $100 ranger service. Tesla reps also provided clear verbal verification that this would be available. So some people bought their car with the expectation this would be provided for their car. In some areas, Tesla have suddenly stopped honoring that $100 ranger service. And guess what, there is no recourse under contract law, because nowhere in Tesla's purchase contract with the owner did it specify that service (it only did if you have a service contract). So the best you can do is sue Tesla for false advertising.