The Yankee Group recently published a report on the substitution of wireless for wireline service. Nobody disputes that this is an ongoing trend. The question is, when will it stop. Do you have both wireless and wireline service? If so, why haven't you cancelled the wireline service? If not, how are you meeting you voice, data, and video communication needs?
Another interesting question is what the wireline carriers should do in response to this trend. Should they abandon their infrastructure and write it off (eg. shrink as a company)? Should they transform their infrastructure in some way? If the latter, how?