It's actually the regular playerbase that is dying. If you check out the hook minsta server, you can see that there are only "whities" (if you know what i mean

) because they are totally new to Nexuiz and they don't know the basics, they don't know how to move fast, so they use hook/jetpack, they don't know how to use the weapons well, so they use instakill weapons. That's why these servers got so popular because they drained the "fresh blood" from normal CTF. And because minsta CTF doesnt have such a deep learning curve as normal CTF has by far (because of the weapons), it will cause these players get bored from minsta ctf after a while and they leave the game.
I think pn.de is dead because since in spring it became extremely laggy and people just didnt stand it

It was popular earlier because it was the ultimate svn testserver with TONS of changes, but because now it doesnt offer anything groundbreaking after 2.5 is out, people decide to choose the less laggy servers just as DCC.