Of course the change should be well planned, players should get plenty of advance warning. I too think Xonotic is now stable enough to ask people to switch in large numbers. Maybe the devs could tell us if THEY think Xonotic is now indeed ready. Are there big balance changes planned for example, which might scare people off again? I don't think there are, and I also think current Nexuiz players will be pleasantly surprised with 0.5.
If DCC switches, their loyal following might hopefully follow and on a personal note: I really miss that server right now. The server list looks full enough at first glance, but I dearly miss a good DM server where my ping is acceptable and I'm sure others do too. Well, I might set up a server myself. One 8 player DM server should not cost TOO much... right? :S
I dislike going into a game and trying to round up users for a different game, no matter how high we think or moral high ground is located at. That should come from server owners and (to Infofoed) it is already a good reason to be kind to server admins. Also: they mostly pay for those servers with their own pocket money so that players can play for free. It is something to not take too lightly.
"Yes, there was a spambot some time ago on these forums." - aa