Blizzard isnt going to go back to Burning Crusade raid designs so the point is moot. But IMO they should think outside the box a little. Just like how HMs are nerfed every month, they can put in an option for hardcore raiders to turn up the damage. Loot is the same but you can give some vanity title/achieves for server best etc. There can be a lot of variation on the idea but the bottom line is that there should be some challenge during farm. It would force people to change their strategy or totally invent new ones to beat the encounters.