As I just mentioned on another thread, I haven't seen the carts around at all this summer. I have never had a JW at the door (we are in town), just a visiting couple once. (That was weird, not sure where they were from.)
There's been some mention of service, but it was also admitted that they like to drive around in fringe areas and waste time. No one mentions any studies.
I'd say energy seems pretty low here. BUT I don't ask because I don't want to appear too interested, I just listen to the chatter.