Now here I am, getting set to run another semester of it. (At least.) That's not a bad thing; I'm doing it because the players enjoy the campaign, and there's still quite a bit left to wrap up just on the plot threads that are already going. I still don't feel like this is going to be one of those games that lasts forever (could be, but some of the players are already talking about doing something different someday, though they're still having too much fun for someday to be soon) but it's kind of nice to see it go a little longer than planned.
And if it hadn't, that would have been okay, too. Intending for the game to be short (though not building it in to the premise) helped it get this far. There were a couple of points earlier where I was frustrated with the game, and would have considered shutting it down then and there, except that I knew that it was only going to run until the semester ended anyway, and then I could be done with it. Now that I'm there, it's good enough to keep going, but it wouldn't have gotten this far if I hadn't had permission to end it in favor of something new when I got to this point.