At the end of every expansion there's always people getting bored and leaving the game: all bosses downed, reputations maxed, friends moving to other games. I'd like to see one or more incentives to keep their accounts active:
1. Title (???)
2. Achievement, "I stuck around and only got this stupid tabard"
3. Special rep allowing slight advantage for leveling in next expansion and/or raid bosses
4. An extra guild reward
5. Other ideas?
I believe something that keeps Blizzard getting more constant income should bring rewards to both players and guilds.