In the nineties, as the Internet became more popular, there was a long-running and often tedious discussion of what the "killer app" was going to be that would make everyone get Internet access. I always thought the whole discussion was a waste of time, because it was obvious to me that at that time, email WAS the killer app. People signed up for Internet access because they recognized the value of email for business use, personal use, or both.
There is a similar discussion underway for broadband and particularly broadband over fiber (i.e. fiber to the home). I think it will be health services and applications. The Internet has already begun to disrupt the way health services are delivered, but we have barely begun to see what is possible. Today, services like Fitnet provide personalized interactive work out sessions, along with related products like the Nike collaboration with Apple that tracks runners and joggers. Apple watchers suspect that the company is going to roll out sophisticated new apps for both iPhones and Macs.
Other companies are preparing to offer doctor visits via HD webcam-enabled software, and if companies like Apple lower the cost of sensors that monitor your health (e.g. blood oxygen levels, heart rate, blood sugar and insulin levels) we could see significant changes in the way health care is provided.
The most potential is for improvements in the management of chronic health problems like diabetes and heart disease, where the ability of low cost sensor to provide hourly and daily monitoring of key information could lead to early diagnosis and better treatment.
Most of these services are going to require a broadband connection, and cutting out just one $80 copay for a doctor visit per month will easily cover the cost of a fiber connection to the residence. Communities with aging populations and/or are desirable retirement locations will want fiber everywhere to deliver health care services where they are needed.