Every game has to change. In my own experience of playing online games, they were always evolving to something else. Once you reach the number one spot, and you see that you know everything about the game you lose interest. You've made your share of friends, enjoyed some success and it's time to move on. There will always be that another game you have to learn something about.

Be honest, has the game become boring to you, or Nordeus did a crappy job? I think it's the first option.