Since everyone plays on WotLK client on Onyxia I think it would be a good idea to add heroic mode of raids. Right now this non-tuned content is EXTREMELY easy to anyone who isn't terrible at the game and such players would enjoy an actual challenge instead of loot pinatas. No new mechanics would be required, simple increase of boss damage and HP would suffice cause it would actually require people to do good DPS and healing instead of coming to raids in absolute trash gear without hit-cap. It would also somewhat justify not nerfing chickens and LW. What would be the reward for doing heroic raids is up to debate. If heroic mode would be added here I personally think it should be hard with bosses having at least 2x more HP and damage (should vary depending on the boss) and the reward would be double loot so instead of 3 items dropping it would be 6.