I have blogged before about the decrease in access lines (see this, for example). While it is not surprising given the increase in wireless only households, this article over at GigaOm shows that the decline has been in the 6% per year range for AT&T, not the 3% range.
As the article correctly points out, this is one of the reasons that the large ILECs have been aggressive in rolling out their broadband infrastructures. Since consumers are increasingly opting for wireless for voice, the only way that the ILECs have to continue receiving a share of the consumer's communications expenditures is to build out broadband, which enables them to compete with cablecos for television and internet access expenditures.
If they don't they have to depreciate their infrastructure at a faster rate than consumers are leaving it, else investors (the company owners) will be left holding the bag. Of course, this is an end-game that they would only play if they decided to cede the marketplace to other access providers. There is no sign that ILECs are interested in that strategy!