I agree entirely. I'm not sure about Alien Arena, but I have noticed with a few of these open source FPS games, particularly AssaultCube (I used to love playing AssaultCube), a certain social phenomena will occur where only a handful of the "elite" developers, contributors, and players will be recognized and their ideas accepted as okay to be part of the game. Anything which conflicts with their interests is deemed bad for the game, even if the larger portion of their user base prefers these "bad" ideas.
So, slowly but surely, the large, interested communities who enjoyed what the elites did not will fade away and find other games. The end result being something like a few weeks ago when I tried to get on one of these games again just to see if things calmed down, and all I saw was a bunch of empty servers.
I understand that people would be protective of their work and after a while, sensitive to ideas of change. I also understand OSS permits people the option of splitting from a community and making modifications to a game they feel make it better. But when it comes down to banning players and servers alike from a master server for playing certain maps and modes too much, then you have a problem.