tenten90, what you experience now is what you will experience in any game after 6 years. WoW, Aion, Tera, Rohan, BDO... it does not matter what game it is. Very, very few games stay interesting to play for more than about 4 years. The few games that are left may hang on another couple years, but when you have seen it all and done it all, there really is nothing left for the game to offer you beyond being a glorified chatroom.
My philosophy is this: A game should be fun to play. When it becomes boring from the mindless repetition, it is time to move on to something new. Any game that can get away from that tedium is the one that usually keeps players interested long enough to survive and draw new players.
Rohan over the past 5 years have advanced by adding content, dungeons, new weapons, armor, pets and accessories as well as adding an entirely new, but poorly integrated, race to explore. But eventually it will cross your line between interesting and boring. that is the time when it is necessary to make your choice. Nobody can make that choice for you and that interesting/boring threshold is different for everyone.
and yes bosshunt. An online game where there is no interaction has no more value to the online player than a single player, disconnected game.