@Naaruminded

Yes, its still possible to get the item, but you need to be level 80 in order to get into the instance and obtain it. It's impossible to get if you're level 60.

@Xexyz
I agree that the problems your raiders face are unfair. I do a lot of classic content at level 80, and even then its annoying at the levels of consistency blizzard show. For instance, the quest you can pick up at Light's hope to find an item in Naxx. The quest is still there, but you can't even obtain the item in the lvl 80 Naxx. I honestly don't think it would be that hard for Blizzard to keep things in game when they re-do it. There was no need to remove old Naxx when they made the new version, there are already several places where characters exist at 2 places at once (Kael'thas, for example), and I don't think it would have been hard to make the level 80 version of Onyxia just 10 and 25 man modes to select, and kept the 40 man in as well.

However, I've never really understood the idea of classic raiding with level 60 characters. Even if you preferred the style of it, the idea of doing it now is slightly odd to me. I just don't think I could stand the idea of finally getting that last piece of loot after 2 years, and then having nothing left to do other than do it on another character, or just repeat the same bosses over and over again for other people, until they all get their loot, and then being stuck with nothing to do... I realise that the fun for you is working hard over a long time to build up gearsets, but don't you get bored killing the same bosses over and over every week? Once I down Lich King, I won't be trying to do it every week, even if he has loot that I want. I Live and let live, though.

I do enjoy checking out old content, just for a change of pace or for reminiscing. Blizzard need to decide, though, whether they want it there for people to check out when they want, or totally remove and say they want to focus on new content or nothing else. Mixed signals is just irritating.