Personally I think people have mostly become tired of bugged, incomplete, and unstable servers, as well as playing the same Chronicles over and over. There haven't really been any C5 servers since Azure and even Azure had a lot of missing C5 content. So far the response we are getting from people on C5 is amazing but only time will tell, the community is pretty unpredictable these days. :) For me the fun in L2 was always the time and work it took to get geared up and than the resulting long-term competition for server domination which used to last years. Hopefully people will make those times happen again and stick with the server instead of server hopping which is so common these days.
The fact that we are bringing the first and only complete C5 server hopefully will stand for something. Either way it has already been quite a bit in CB and on our IRC, and I don't see that stopping anytime soon :)