I agree with your observation JH! JW?s are slowing done, at least in the US! The current "witnesses" efforts are a fraction of what I grew up with!
Interestingly, my street isn?t hit, but once a year if that! Most JW?s in the area prefer to ride around, and around, and around, and around (got you spinning yet?), make a few "calls" on folks they know are not home, then go home themselves, often without talking to a single person!
When I still went out in field service, one of the pioneers in my Congo actually kept her time going at a restaurant the car group ended up at, by making sure a tract was visible from a pocket in her skirt! She made the group aware that this is what she was doing, because she needed the "time!"