I've had to back and forth Montgomery mall a few times today (really hate malls around Christmas, but whatever).
The supercharger seemed functional and in use during all those times. Also it was never available, someone or the other was plugged in. And I don't think they were demo cars.
Looks like this supercharger is so far there, waiting to die a natural death.
However, did you see the projected 2017 map? Looks quite clear that there is a supercharger planned for the 270/495 interchange, and another one in Frederick.