I haven't thought of this before, but I hope Tesla is clever enough to show a site as "reduced service" in the nav for at least a few hours before a service tech shows up to do work that will actually reduce the service. That way any cars already en route when the change is made and for whom it's too late to divert will still have what regular access already exists. And those planning future/upcoming stops will be capable of knowing far enough in advance to make back-up plans or totally divert. It would definitely be the smart play and should be policy but I've no info on whether it actually is.