Not in my area Lama, I live in a rural area where building is strictly controlled, so we have had few new dwellings in my old Congregation's territory, and there are more active JW's, moved in mostly, but more of the buggers.
Not so many years ago they got round the whole area in 3 months , now it is 9 months, without doubt here there has been a slow down, quite what it is due to I don't know, they couldn't possibly have started walking any slower than they did !
I would guess that it is a lack of enthusiasm, perhaps some have stopped pioneering, and just maybe they have been exhorted to actually engage householders in a proper conversation ? nah, probably not. Not many of 'em capable of that.