I started WoW in Wrath of the LIch King, so I never got to experience Karazhan or Blackwing Lair the way it should have been experienced as a whole raid and co-op; not ignoring mechanics or farming it by yourself weekly to get that transmog you need.
Hopefully with the rescale of stats, maybe they could implement a challenge mode/ 10/25man lfr type que for old raids but scaled down? I think it would be popular and would take less or just as long as if you were queuing up as a dps in lfr. It will be new for some and a nostalgic fight for others.
It would also be a great time to bring back weekly raid rewards.
Any constructive thoughts?