Actually it's a failure of our elders to connect with our youth.
What is the solution? Technology. Facebook, Myspace, etc.
Young people connect via technology, not interpersonally. So if you want them to go hiking more, you have to connect to them with technology.
They like finding out about hiking events on YouTube, Facebook, Myspace, Meetup, etc. They also like to document their hikes using technology. Unlike older folks who espouse technology while on the trail.
The Sierra Club hasn't figured this out yet which is why very few young people go on their hikes. Yet you'll see a lot of young people hiking together, only they organized through Meetup, etc. and oftentimes only a day or two earlier.
That is another difference between the generations. The Sierra Club lives in a world where hikes are planned weeks or months in advance. Young people live in a world where hikes are planned often hours or days before they begin.
So fear not. It is only a change in paradigm. Young people are creating a whole new generation of hikers driven by technology.
Our only concern is that they appreciate what we've fought to preserve and to make sure they keep fighting to preserve it. Hopefully, some brave elders will take the initiative to reach out to their younger counterparts and show them the way. Is the Sierra Club listening? That is our challenge.