There's simply nothing to talk about.
GW2 is not dead however. Player count has been dropping for a long time, but if you log in and play, you see people, at least in some areas.
MMOs should not be lacking in meaningful things to discuss. Even if one can maintain enough of a constant population to find others to do things with, if there is nothing worth doing with them and nothing worth discussing with them, the game is stale, which is just as bad as being dead.