I think that the days of printed media are quickly coming to an end. I'll admit that I use a phone book at home, but it is only 1" thick and not to inconvenient. At the office, there are seven different sets of 3" directories to cover the entire metro area. Too much of a hassle. Verizon just delivered 28 new phone books to my office. We called and asked them to come back and get them, which they are going to do. They said that they are getting a lot of these requests.
I've noticed the same thing with newspapers. They've reduced the overall dimensions so much that I can barely read it. Hardly any ads except for car and furniture dealers.
No doubt that Internet advertising is here to stay.