The answer may surprise you.

MSN has an article on the growing trend of Internet blogging among seniors. According to the Pew Internet and American Life Project, about 3% of seniors have created a blog, and 17% have a read a blog, but the number is growing. The main motivating factor seems to be the desire for seniors to keep in touch and stay connected with the world, as well as creating an activity with which to pass the time and stimulate the brain.

To me, the very ability of blogging to span across so many demographics and interest groups signals without a doubt that blogging is indeed a trend and not a fad. This, combined with blogging's ability to fullfill a very basic human need and desire -- that of communication -- signals it is here to stay.