The video game community I met my wife in 15 years ago... still exists. Pieces of it died over the years (there was a time when basically nobody could get the game to run and the competitive sites all disappeared) but there have always been a handful of core sites that stuck around, and a handful of developers managed to revamp the game for modern play. One of the major groups has been running since 1996, though it had a few years of extremely low activity.
About a year ago, an old friend contacted us and let us know he was playing again. We contacted friends, and they contacted friends, and now we've got a bunch of us back together -- playing every day, even going to a LAN party this week.
Part of what's interesting is that some of the major sites that didn't survive have sort-of but not entirely lived on in new incarnations. The new competitive ladder is based around some of the same principles as the old one, but with some influences from newer games as well (like a Starcraft2-style tier system that ranks players as gold, silver, or bronze.)
If you remember Descent fondly, come join us: http://descentchampions.org/new_player.php (includes links to many of the still-active sites and groups.)