Oh, no doubt people will run it and re-run it to death. That's not really the point. The point is that it is probably an average 3 months investment per individual staff, on the minimum. Even assuming there are dozens of Naxx raids happening per week (possibly highly unlikely), it is going to be YEARS before a significant portion of the Naxx raiding community even comes close to completing them. Not to mention the amount of burnout and people just quitting over time. I mean, I might be a bit fuzzy on how many pieces of loot each boss drops, you could probably fully gear your entire raid in Naxx gear before you even complete your second staff. How many people are going to stick around to help get Mages/Locks/Priests/Druids a staff when the other half of the classes in the game will have nothing further to get from the raid by then?