I personally haven't posted anything here, or even opened Sauerbraten, for almost a month. (Hello again All!)
For me, it's mainly an issue of time and creative energy. I was never particularly prolific (or particularly good, for that matter) of a mapmaker, but more recently, I haven't had much desire to make maps. The only thing I've finished this year that I also started this year was a couple simple race maps. Instead, I've spent my creative energy on projects for my education. I just finished up designing an art gallery.
The overall point here is that for a lot of people, one thing can be their driving ambition for a while, but it can't always be their top priority. For me, Sauerbraten has not even been on my list of things I'd LIKE to accomplish recently. I feel like for a lot of people, it's sort of the same way.