I wonder. Would they really need one at a service center? Surely a few HPWCs will do the job for them.
For me, it makes a lot of sense. If I travel up to St.Louis for the Cardinals game (at least once a year I do this) I could drop by, pick up some swag, get my wipers changed out, top up the drained battery and be out of there in an hour or less and not miss a minute of pre-game tailgating and I'll be all set for the trip home the next morning. Even with the twin chargers we're looking at a minimum of 5 hours sitting around the shop. Since I often don't get to STL until 3 or 4 pm on game day that wouldn't work at all. Now, if they wanna offer courtesy service and shuttle me to and from the hotel and such that might work.
That said, in a busy shop servicing several vehicles a day it's a bit impractical to have 10 cars all hooked up to HPWCs taking up space and time, but with the supercharger they could top folks up and have them ready to go in minutes.