Every time I speak to an active JW in my congregation, they don't give me the impression that they are slowing down. If I say that I see less JW's on the street knocking on doors, they will say that many are working full time. They will also probably say that the hall is always full of people.
I don't go to the hall anymore, so I can't say if the hall is full or not, but I notice that there are way less JW's going door to door than before in this area.