D2D is not over but it is on the demise that is true. In my old congregation(s) only a handfull of witnesses came to the field service meeting on Saturday and I doubt the others went to service without going to the field service.
In this congregation we are in at the moment, even though more come to the field service, many just want to do "easy" witnessing. We have a lot of interested ones coming to the congregation with no plans of getting baptized, they have kids, often more than three. They always want a witness to study with them. 80% who come to the (new and improved 5 - 7 minute) field service meeting go studies and maybe only the 20% are going from door to door.
From my own experience, whenever a pioneer asks me to go to service with him, it is always a study or a return visit/magazine route thing. Actually, the first time I went with an elder to preach when we relocated congregations and he saw that I was taking him to a territory with zero adresses but lots of small houses and this meant a lot of searching, he deemed it time wasting and we should have gone into the city and did street witnessing instead.
Then we have the zealot pioneers which embraced social networks and probably count time on there as well. I even heard of witnesses conducting studies over Skype!
So yeah Witnesses try avoid door to door.
But my report might not be accurate as I am not in a congregation where they speak the local language.