I know what you mean, Adam, and I wonder, whither Star Trek? Or rather, Trek fandom? While at times it seems like the fans are going strong, there are plenty of sites I once had bookmarked that have disappeared. A change in tastes, maybe? Perhaps fewer people are making their own "corner" of Trek-dom, whether it be clubs, fiction, games (like ours). That said, as the admin for a metropolitan ST group, I've been surprised in the last year at the "youngsters" that have shown up at meetings, kids in their teens (and 20s) who grew up after most of what is ST went off the air but still found the appeal of it. (OK, so did I, as in TOS went into syndication the year I started watching, 1970, but then new stuff started showing up)
A side note - TBS has a reality/game show called "King of the Nerds," pitting a house full of nerds against each other. Silly fun, but the theme of last week's was "Star Trek vs Star Wars," culminating in a debate. During the debate it was noted that, in things like Facebook, "Wars" has more "likes" than "Trek," so maybe Trekkies are less numerous but more... committed? Dedicated? The pro-Trek side won the debate, naturally