It's not always because of a lack of broadband access. I just convinced my parents to cancel our AOL subscription last year, and we've had DSL for 6 years now. In their case, they liked the idea of having AOL dialup as a backup when traveling, and they were worried that they would lose their @aol.com email addresses if they cancelled. I hooked them up with free dialup and verified that they could still use their email without paying for a subscription, and now we're $27/month lighter.