4. Landline Telephones
According to the latest survey from the National Center for Health Statistics, [[xref:http://www.cdc.gov/nchs/data/nhis/earlyrelease/wireless201005.htm|nearly 25 percent of Americans have ditched their landlines|Products - Early Release - Wireless Substitution - July-December 2009]] for a cell phone. Another [[xref:http://www.theinquirer.net/inquirer/news/1593216/hard-voip-users-100-million|22 million]] or so Americans pay for a VoIP service like Vonage to reach out and touch. Still, that leaves well over 100 million households firmly tethered to one of Ma Bell's bastard offspring. (No doubt many of these lines are also plugged into fax machines.)
Why? Because nothing says "I've fallen and I can't get up" quite like a landline. Only 5 percent of adults age 65 or older live in wireless-only households, per the NCHS--no doubt in part because mobile E911 emergency services still aren't as reliable as calling for help from your trusty wall-mounted phone. As that population gradually moves toward that great early bird special in the sky, landlines will likely follow.