I think step one to preserving raids is the ilvl and making it cap closer to the entry amount. There's a lot of raid fights I never got to experience, and these days they're utterly blown through due to ilvl caps. Hell, even with the raids I did get to experience closer to release... I kind of just feel empty inside since we trounce on them so quickly now. Melting bosses before they get to play the game just isn't fun, it's just a chore.