its time for a change, the formula has become old and stale, people are craving for the game to shake it up a little. Class balance tweaks aren't cutting it anymore, waiting for new dungeons to grind isn't as interesting as it once was. The game was exciting when it felt like there was new discoveries to be found, both in the world and its mechanics. The game felt more alive people were trying new things, new ideas, well the subclass system change that, maybe.. somewhat.