You may notice from my posts that I am one of those people who have left. I am lucky enough to now identify when a developer has no control or begins ignoring the problem. I myself left a day after the floor 8 Mushin Towers came out.
It took me a while to learn, but it is a difficult concept to grasp. After pouring your heart and soul into a game and having to admit its eventual defeat is tough. Arena is probably not dead and it may take a while, but it will likely end up much like Archeage did.
Games like Warhammer Online, Archeage, Final Fantasy Online (first one) all