As long as we can't get more superchargers, I think those shopping malls that can't should consider to install 3 phase 32A chargers (type-2). Although slower than superchargers, almost every EV can use them, and at 100 km/h or more (dual chargers), they are fast enough to charge up completely while you watch a movie or have a dinner + shopping. May I in this regard suggest Kwai Chung Estate, which is close to both the Tesla Service Centre and Tsing Yi maritime square: Free parking for EVs for two hours, 7 bays of 32A/~3 (22 kW dual, 11 kW single charger installed). Very basic restaurants and shops, but they do have supermarket, "Japans store", cheap ice cream and similar.
And even 13A BS1363 chargers have a place: Overnight charging or while being at work, they are basically wall outlets, dirt cheap to install. There should be loads of them, especially at places like the airport long term parking (parking #2). Since they can supply a maximum of about 2 kW, they won't be a huge cost on top of what an existing parking fee covers.
Regarding superchargers showing how many cars are charging, and how low the SOC of the cars are - it wouldn't show how many are waiting, which often adds to it as well.
Since Tesla knows where every car is located and its state of charge, they could avoid privacy issues by simply making either smileys at each place, or a time for estimated next charger available - or both.
Simply a green smiley if it's open for use, a yellow one if at least one car is about to be fully charged and a red one if all stalls are taken by half empty cars.
If Tesla Motors were really, really smart, they would include this: Any supercharger enabled car that uses navigation and selects a supercharger (or that parking lot/spot), the system would consider this cars estimated arrival and it's charge when arriving. In other words, if there is one spot available, but my car is there in 7 minutes, with estimated 20% SOC, then it would show to other cars (which are more than 7 minutes away) that it's full.
If people would use their navigation while going to superchargers, this would make the estimated time much more precise. Only downside is that some people will keep the car there even after they are done charging (while a few will move it before they are done charging). It doesn't say you have to move your car when you are done charging - so despite all common sense and good citizenship, it's no guarantee that people will come and move their cars, once done charging. We have seen on many occasions that some don't plug in, or just leave their car there all day.
And finally - ICEing of the superchargers probably won't show in such a system, unless there is a system to detect if a car is parked there, and not even plugged in.